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Black Mesa (video game)/Achievements

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Black Mesa, a fan-made remake of Half-Life, comes with 50 Achievements, listed here in roughly chronological order.


Image Achievement Official description Chapter How-to
Achievement Proverbial Tinkerer.jpg Proverbial Tinkerer Interfere with the alarm and laptop in Anomalous Materials. Anomalous Materials Gordon must interact with a laptop seen at the beginning of the chapter, near the security guard welcome desk, as well as push an alarm button located under it. Doing so will cause the NPCs to react - in the first case a scientist will tell Gordon to get away from the device, and in the second case - an alarm will begin to reverberate.[Vid]
Achievement Convection Refinement.jpg Convection Refinement Ruin the microwave casserole. Anomalous Materials Gordon has to press a button on the microwave. After a while, it overheats, causing the achievement to unlock.[Vid]
Achievement Brownian Motion.jpg Brownian Motion Pass the toilet paper to the scientist in need. Anomalous Materials Gordon has to give a scientist in the WC a roll of toilet paper. A roll of paper towels from the same shelf will also count.[Vid] Reference to the term "Brownian motion."
Achievement Less Than Desirable Consequences.jpg Less Than Desirable Consequences Die in the AMS Beam before starting the experiment. Anomalous Materials Once the Anti-Mass Spectrometer laser comes online, jump inside it.
Achievement Resonance Procrastinator.jpg Resonance Procrastinator Refuse to insert the specimen into the Anti-Mass Spectrometer. Anomalous Materials After the delivery cart appears in the test chamber, Gordon has to simply refuse to push it. After a while (roughly sixty seconds), the Anti-Mass Spectrometer will overcharge and kill Gordon, unlocking the achievement.[Vid]
Achievement Caffeine Extraction.jpg Caffeine Extraction Perform surgical caffeine extraction from 20 machines. Any chapter with a vending machine after they first appear in Anomalous Materials Gordon has to push the vending machine's button 20 times so it spawns a can. Note that he doesn't need to drink any of the cans and one vending machine can spawn up to 15.[Vid]
Achievement Rare Specimen.jpg Rare Specimen Send the Hidden Hat to Xen. Unforeseen Consequences
(Steam version)
"Forget About Freeman!"
(free version)
through Lambda Core
Gordon has to take the purple hat to the Lambda Complex and jump into the Xen portal while holding it. In the free version, it can be found in a container in the chapter "Forget About Freeman!".[Vid] In the Steam version, the hat can be found after the Resonance Cascade, near the entrance to Sector C.
Achievement The Rarest Specimen.jpg The Rarest Specimen Carry the Hidden Hat to Endgame. Unforeseen Consequences through Nihilanth After taking the hat to Xen, Gordon has to carry it even further, all the way to the Nihilanth fight.
Achievement Inflammatory Actions.jpg Inflammatory Actions Kill a Headcrab using fire. Any chapter with a flare and a Headcrab, both of which first appear in Unforeseen Consequences The easiest way to obtain the achievement is to pick up one of the flares during the chapter Unforeseen Consequences, when they are first seen, and throw at or touch a Headcrab with it. Note that the Headcrab has to die only due to fire so Gordon should be careful if he's travelling with a Security Guard.[Vid]
Achievement Unified Coupling Theorum.jpg Unified Coupling Theorum Help the Barnacle and Headcrab find true love. Any chapter with a Barnacle and a Headcrab, both of which first appear in Unforeseen Consequences Gordon has to let 10 Headcrabs be caught by a Barnacle. The easiest way is to "camp" the conveyor belt in We've Got Hostiles. Saving the game before the Headcrab is killed helps obtain the achievement faster.[Vid] Reference to the Grand Unified Theory.
Achievement Well-Done.jpg Well-Done Cook a grenade for too long. Any chapter after acquiring grenades in Unforeseen Consequences Hold down alt-fire to pull the grenade's pin and wait until it explodes in Gordon's hand. Reference to well-done steak.
Achievement Prophylactic Suggested.jpg Prophylactic Suggested Get overtaken by a Headcrab's ample anterior. Any chapter with a Headcrab in it Gordon simply has to be killed by a Headcrab. To speed up the process, he can hurt himself using explosives.[Vid]
Achievement Mega Hertz.jpg Mega Hertz Kill 5 enemies with one grenade. Any chapter after acquiring grenades The easiest way to obtain the achievement is to gather five or more Headcrabs in one place, let them be close to Gordon and "cook" or detonate the grenade "in hand". Doing this will almost always hurt Gordon so saving the game in advance is advised.[Vid]
Achievement Permeable Infrastructure.jpg Permeable Infrastructure Use the alternate path in Office Complex. Office Complex [Vid]
Achievement Our Brains And Your Brawn.jpg Our Brains And Your Brawn Assemble all the possible Scientists and Guards at the end of Office Complex. Office Complex Gordon will need to gather a party of 4 guards and 2 scientists (a man and a woman) and escort them to the elevator shaft at the end of the level. Beware that the guards can accidentally shoot and kill each other during a fight. Reference to one of the scientists' oft-repeated lines in the original game.
Achievement Calculated Trajectory.jpg Calculated Trajectory Kill 10 Airborne Headcrabs using the Shotgun. Any chapter with Headcrabs in it, after acquiring the Shotgun either in
Office Complex
(Steam version)
We've Got Hostiles
(free version)
Achievement Digital Wizardry.jpg Digital Wizardry Kill 10 enemies with a reprogrammed Sentry. Any chapter with a Sentry Gun after they first appear in We've Got Hostiles This achievement can be unlocked by picking up an inactivated Sentry Gun and letting it kill enemies.[Vid]
Achievement Kinetic Repulsion.jpg Kinetic Repulsion Kill a Marine with their own grenade. Any chapter with HECU after they first appear in We've Got Hostiles Self-explanatory. During a fight, a Marine can toss a grenade to either try to kill Gordon or force him to come out of hiding. Gordon needs to pick up the grenade and throw it at the soldier. The achievement unlocks only if the Marine that tossed the grenade is killed.[Vid]
Achievement Remote Detonation.jpg Remote Detonation Kill a Barnacle with a Satchel. Any chapter with a Barnacle, after acquiring a satchel in Blast Pit Gordon has to throw a satchel at the Barnacle's tongue and detonate it after a few seconds.[Vid]
Achievement Gray Matter Propulsion.jpg Gray Matter Propulsion Headshot 20 enemies with the .357 Magnum. Any chapter after acquiring the .357 Magnum either in
Blast Pit
(Steam version)
Office Complex
(free version)
Self-explanatory. Headshots on Assassins don't seem to count.[Vid] Reference to the term "Grey matter."
Achievement One Step Ahead.jpg One Step Ahead Kill 10 Enemies with Tripmines. Any chapter after acquiring tripmines​​ in Power Up Self-explanatory.
Achievement Dead Reckoning.jpg Dead Reckoning Kill an Assassin with the .357 Magnum. Apprehension,
"Forget About Freeman!"
Self-explanatory.[Vid] Reference to the term "Dead reckoning."
Achievement Ethically Questionable.jpg Ethically Questionable Conduct all of the questionable research experiments. Questionable Ethics Gordon has to kill an Alien Grunt, Snarks, a Bullsquid and Headcrabs using the laboratory equipment.[Vid]
Achievement Pepperoni Precipitation.jpg Pepperoni Precipitation View the *other* secret ending. Questionable Ethics through Nihilanth Gordon has to find Dr. Horn's pizzabox in the cafeteria in Questionable Ethics and take it with him to Xen, and then take it to Nihilanth.
Achievement Universal Gravitation.jpg Universal Gravitation Get killed by your own Snarks. Any chapter after acquiring Snarks in Questionable Ethics Self-explanatory.[Vid] Reference to Newton's law of universal gravitation.
Achievement Quantum Capacitance.jpg Quantum Capacitance Overcharge it anyway. Any chapter after acquiring the Tau Cannon in Questionable Ethics Gordon has to simply overcharge the Tau Cannon by holding the alternative fire button and waiting a few seconds.[Vid] Reference to the term "Quantum capacitance."
Achievement Futile Resistance.jpg Futile Resistance Kill 10 enemies with Snarks. Any chapter after acquiring Snarks Self-explanatory.[Vid] Reference to the phrase "Resistance is futile."
Achievement Stealth Technology.jpg Stealth Technology Escape the Hangar in Surface Tension without alerting the Soldiers. Surface Tension [Vid]
Achievement Nuclear Fishin.jpg Nuclear Fishin' Kill an Ichthyosaur with either the Tau or Gluon. Surface Tension, Xen, Gonarch's Lair, Interloper Self-explanatory. Note that both Tau and Gluon don't work underwater so Gordon should let the Ichthyosaur focus on him, get out of the water (either to the surface while aiming downward, or out of the water entirely) and kill it before it disappears out of sight.[Vid]
Achievement Centripetal Attraction.jpg Centripetal Attraction Kill 20 enemies with the Hivehand. Any chapter after acquiring the Hivehand in Surface Tension Self-explanatory.[Vid] Reference to the term "Centripetal force."
Achievement Hyper Saturation Conundrum.jpg Hyper Saturation Conundrum Drown in Lambda Core's coolant. Lambda Core Self-explanatory. To drown in the coolant faster, Gordon can hurt himself using any kind of explosives, Snarks, or by overcharging the Tau Cannon.[Vid] Reference to the term "Hypersaturation."
Achievement xen when.jpg xen when Wait too long to jump into the Lambda Teleporter. Lambda Core Once the portal to Xen opens, don't jump in. After a minute, the portal will overload, killing Gordon. Reference to the infamously long wait for Black Mesa's Xen chapters to be released. (In the current version of Black Mesa, this achievement is broken)
Achievement Premature Expulsion.jpg Premature Expulsion Use an entire clip of Gluon ammo in one continuous shot. Any chapter after acquiring the Gluon Gun in Lambda Core After Gordon obtains the Gluon Gun, he must use the whole ammunition available - 100 Depleted Uranium-235 units - in one continuous shot.[Vid] Reference to the term "Premature ejaculation."
Achievement Orbital Trajectory.jpg Orbital Trajectory Skip the opening Xen island with a secret jump. Xen Upon reaching Xen, instead of going down the path on the left, jump on the rocks to the right. [Vid]
Achievement Following the Rules.jpg Following the Rules Use the welcome mat. Xen After going through a large, blue cavern lake with Barnacles and Ichthyosaurs, Gordon will enter a man-made research habitat. At the entrance, a sign instructs visitors to wipe their feet using the mat. Crouch on the mat and use the interact key to unlock the achievement.
Achievement The Plan.jpg The Plan Use Cyanogen to kill Gonarch. Xen through Gonarch's Lair In the laboratory outpost in Xen, Gordon will find a canister of cyanogen, which must be carried to the end of Gonarch's Lair.
Achievement Unquestionably Ethical.jpg Unquestionably Ethical Don't use the Cyanogen and let the Gonarch live. Xen through Gonarch's Lair In the laboratory outpost in Xen, Gordon will find a canister of cyanogen, which must be carried to the end of Gonarch's Lair. At the end, instead of using the gas on the Gonarch, Gordon must escape with the Gonarch unharmed.
Achievement Post-Mortem Interval.jpg Post-Mortem Interval Find each member of the missing research teams. Xen through Gonarch's Lair Gordon must find the bodies of 7 HEV-clad scientists scattered around the Gonarch's Lair. Either picking up the supplies found on them, interacting with or crouching on them is required to advance the achievement. The last body is only accessible if the Cyanogen canister is brought along.
Achievement Prolific Popper.jpg Prolific Popper Kill all Protozoans in the Borderworld. Xen through Interloper There are 64 protozoans to be killed, 37 of them are found in Xen, 22 in Gonarch's Lair (1 requires the Cyanogen gas canister to be brought along) and 5 at the end of Interloper.
Achievement Gonad Glider.jpg Gonad Glider Get whacked into oblivion in the ledge fight. Gonarch's Lair During the first battle with the Gonarch (the ledge fight), let it kick Gordon into the abyss below.
Achievement Doctor's Signature.jpg Doctor's Signature Deliver the finishing blow to Gonarch with your Crowbar. Gonarch's Lair Self-explanatory. Upon taking fatal damage, the Gonarch will move to the center of the arena and explode.
Achievement Anti-Matter Over Mind.jpg Anti-Matter Over Mind Kill a Controller without killing any of its mind-controlled Vortigaunt slaves. Interloper Self-explanatory. A single headshot with a Crossbow will put a Controller down.
Achievement PhD in Pacifism.jpg PhD in Pacifism Don't kill any Vortigaunts in the Borderworld. Interloper Self-explanatory. The achievement will unlock upon reaching the summit of the Alien Grunt factory.
Achievement Contest Propellant.jpg Contest Propellant Find the snack supply canister. Interloper After battling Controllers in the Vortigaunt ghetto, Gordon must go through a vent near the entrance of the village in order to advance. To the left are some breakable boxes hiding a passageway leading up, at the end a canister containing snacks will teleport in, unlocking the achievement. [Vid]
Achievement Black Mesa Decathlon Winner.jpg Black Mesa Decathlon Winner Escape the Gargantua’s Lair without taking any damage from Gargantuas. Interloper Self-explanatory. As it says, only damage from the Gargantuas count; taking damage from the other creatures in the area will not void the achievement. Reference to the Black Mesa Hazard Course Decathlon. Quick saving or manual saving while in the map will negate the achievement.
Achievement Laser Immunization.jpg Laser Immunization Complete Interloper without taking any laser damage. Interloper Self-explanatory. The achievement will unlock upon reaching the summit of the Alien Grunt factory. Quick saving or manual saving while in the map will negate the achievement.
Achievement Specimen GG.jpg Specimen GG Take out all three Healing Crystals in Nihilanth’s Chamber at the same time. Nihilanth After inflicting enough damage on Nihilanth, 3 crystals will appear from apertures next to him. Throw down a satchel charge next to each of them and detonate them simultaneously. Reference to both Specimen GG-3883, the Xen crystal sample that started the Resonance Cascade, as well as the internet gaming slang GG.
Achievement Late for Work.jpg Late for Work Defeat Nihilanth in under 4 minutes. Nihilanth Self-explanatory.
Achievement Limitless Potential.jpg Limitless Potential Accept G-Man’s offer of employment. Endgame After G-Man finishes his speech, simply step into the portal.
Achievement Rather an Anticlimax.jpg Rather an Anticlimax Decline G-Man’s offer of employment. Endgame After G-Man opens the portal, don't enter and instead wait for 30 seconds.


In bms_english.txt, there is a reference to an additional, possibly cut achievement named Instability Paradigm. Its description states "Experiment on 5 scientists".[1]


  1. STEAMPATH\SteamApps\common\Black Mesa\bms\bms_misc_000.vpk\resources\bms_english.txt, "BMS_INSTABILITY_PARADIGM_NAME" "Instability Paradigm" and "BMS_INSTABILITY_PARADIGM_DESC" "Experiment on 5 scientists."