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Black Mesa

Black Mesa

50 / 50 achievements100%100% COMPLETE ✓
Ultra Rare15 / 15
Very Rare17 / 17
Rare14 / 14
Uncommon2 / 2
Common2 / 2

About Black Mesa's achievements

Black Mesa has 50 Steam achievements, 15 of them ultra-rare — unlocked by under 5% of players. The rarest is "Prolific Popper", earned by just 2.0% of players. 14 SteamVault members have 100%-completed it so far. Below is the complete achievement list with global rarity and a full achievement difficulty breakdown.

Rarest achievement
2.0%
of players earned "Prolific Popper"
SteamVault 100%s
14
members fully completed it

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All Black Mesa achievements

Your unlocked achievements
50 achievements
Pepperoni Precipitation
✓Pepperoni Precipitation
Ultra Rare2.0%✓ 27 Jun 2026
Unquestionably Ethical
✓Unquestionably Ethical
Ultra Rare2.4%✓ 27 Jun 2026
The Rarest Specimen
✓The Rarest Specimen
Ultra Rare2.1%✓ 26 Jun 2026
The Plan
✓The Plan
Ultra Rare2.5%✓ 26 Jun 2026
Rare Specimen
✓Rare Specimen
Send the Hidden Hat to Xen.
Ultra Rare2.8%✓ 26 Jun 2026
Contest Propellant
✓Contest Propellant
Very Rare10.7%✓ 26 Jun 2026
Black Mesa Decathlon Winner
✓Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Ultra Rare3.6%✓ 16 Jun 2026
Prolific Popper
✓Prolific Popper
Kill all Protozoans in the Borderworld.
Ultra Rare2.0%✓ 16 Jun 2026
Specimen GG
✓Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Ultra Rare3.2%✓ 10 Jun 2026
Late for Work
✓Late for Work
Defeat Nihilanth in under 4 minutes.​
Ultra Rare3.3%✓ 10 Jun 2026
Laser Immunization
✓Laser Immunization
Complete Interloper without taking any laser damage.
Ultra Rare2.5%✓ 10 Jun 2026
Doctor’s Signature
✓Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar.
Ultra Rare3.3%✓ 10 Jun 2026
Post-Mortem Interval
✓Post-Mortem Interval
Find each member of the missing research teams.
Ultra Rare2.1%✓ 10 Jun 2026
Gonad Glider
✓Gonad Glider
Get whacked into oblivion in the ledge fight.
Very Rare5.9%✓ 10 Jun 2026
Following the Rules
✓Following the Rules
Ultra Rare3.9%✓ 10 Jun 2026
Orbital Trajectory
✓Orbital Trajectory
Skip the opening Xen island with a secret jump.​
Ultra Rare3.8%✓ 10 Jun 2026
xen when
✓xen when
Ultra Rare4.5%✓ 9 Jun 2026
Hyper Saturation Conundrum
✓Hyper Saturation Conundrum
Drown in Lambda Core's coolant.
Very Rare5.9%✓ 9 Jun 2026
Premature Expulsion
✓Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot.
Rare26.4%✓ 9 Jun 2026
Stealth Technology
✓Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers.
Very Rare10.7%✓ 9 Jun 2026
Universal Gravitation
✓Universal Gravitation
Get killed by your own Snarks.
Very Rare10.6%✓ 9 Jun 2026
Centripetal Attraction
✓Centripetal Attraction
Kill 20 Enemies with the Hivehand.
Rare22.7%✓ 9 Jun 2026
Nuclear Fishin'
✓Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon.
Very Rare12.2%✓ 9 Jun 2026
Futile Resistance
✓Futile Resistance
Kill 10 Enemies with Snarks.
Very Rare7.0%✓ 9 Jun 2026
Ethically Questionable
✓Ethically Questionable
Conduct all of the questionable research experiments.
Very Rare5.3%✓ 9 Jun 2026
One Step Ahead
✓One Step Ahead
Kill 10 Enemies with Tripmines​​.
Very Rare6.0%✓ 9 Jun 2026
Remote Detonation
✓Remote Detonation
Kill a Barnacle with a Satchel.
Very Rare11.2%✓ 9 Jun 2026
Unified Coupling Theorum
✓Unified Coupling Theorum
Help the Barnacle and Headcrab find true love.
Very Rare6.4%✓ 9 Jun 2026
Digital Wizardry
✓Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry.
Very Rare8.8%✓ 9 Jun 2026
Kinetic Repulsion
✓Kinetic Repulsion
Kill a Marine with their own Grenade.
Very Rare6.0%✓ 9 Jun 2026
Our Brains And Your Brawn
✓Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex.
Very Rare5.2%✓ 9 Jun 2026
Permeable Infrastructure
✓Permeable Infrastructure
Use the alternate path in Office Complex.
Rare23.3%✓ 9 Jun 2026
Mega Hertz
✓Mega Hertz
Kill 5 Enemies with one Grenade.
Rare18.7%✓ 9 Jun 2026
Prophylactic Suggested
✓Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior.
Uncommon33.2%✓ 9 Jun 2026
Resonance Procrastinator
✓Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Very Rare9.5%✓ 9 Jun 2026
Less Than Desirable Consequences
✓Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment.
Rare15.6%✓ 9 Jun 2026
Rather an Anticlimax
✓Rather an Anticlimax
Decline G-Man’s offer of employment.
Rare16.5%✓ 9 Jun 2026
Limitless Potential
✓Limitless Potential
Accept G-Man’s offer of employment.
Rare24.9%✓ 9 Jun 2026
Well-Done
✓Well-Done
Cook a Grenade for too long.
Rare18.8%✓ 9 Jun 2026
Anti-Matter Over Mind
✓Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Rare27.6%✓ 9 Jun 2026
PhD in Pacifism
✓PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld.
Very Rare11.7%✓ 9 Jun 2026
Quantum Capacitance
✓Quantum Capacitance
Overcharge it anyway.
Rare18.7%✓ 9 Jun 2026
Dead Reckoning
✓Dead Reckoning
Kill an Assassin with the .357 Magnum.
Rare23.0%✓ 9 Jun 2026
Calculated Trajectory
✓Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun.
Very Rare13.4%✓ 9 Jun 2026
Gray Matter Propulsion
✓Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum.
Uncommon36.6%✓ 9 Jun 2026
Caffeine Extraction
✓Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines.
Rare21.0%✓ 9 Jun 2026
Inflammatory Actions
✓Inflammatory Actions
Kill a Headcrab using fire.
Rare25.6%✓ 9 Jun 2026
Convection Refinement
✓Convection Refinement
Ruin the microwave casserole.
Common50.2%✓ 9 Jun 2026
Brownian Motion
✓Brownian Motion
Pass the toilet paper to the Scientist in need.
Common61.0%✓ 9 Jun 2026
Proverbial Tinkerer
✓Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials.
Rare16.3%✓ 9 Jun 2026