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. 12 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

members fully completed it

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Difficulty—

Easy → Brutal

Enjoyment—

Meh → Loved it

Grindiness—

No grind → Huge grind

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All Black Mesa achievements

Your unlocked achievements

50 achievements

✓Rare Specimen

Send the Hidden Hat to Xen.

Ultra Rare2.8%✓ 30 Jun 2026

✓The Rarest Specimen

Ultra Rare2.1%✓ 30 Jun 2026

✓Pepperoni Precipitation

Ultra Rare2.0%✓ 30 Jun 2026

✓Gonad Glider

Get whacked into oblivion in the ledge fight.

Very Rare5.9%✓ 30 Jun 2026

✓Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

Rare15.6%✓ 30 Jun 2026

✓Rather an Anticlimax

Decline G-Man’s offer of employment.

Rare16.5%✓ 30 Jun 2026

✓Limitless Potential

Accept G-Man’s offer of employment.

Rare24.9%✓ 30 Jun 2026

✓Laser Immunization

Complete Interloper without taking any laser damage.

Ultra Rare2.5%✓ 30 Jun 2026

✓Late for Work

Defeat Nihilanth in under 4 minutes.

Ultra Rare3.3%✓ 30 Jun 2026

✓Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time.

Ultra Rare3.2%✓ 30 Jun 2026

✓Prolific Popper

Kill all Protozoans in the Borderworld.

Ultra Rare2.0%✓ 30 Jun 2026

✓PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

Very Rare11.7%✓ 30 Jun 2026

✓Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.

Ultra Rare3.6%✓ 30 Jun 2026

✓Contest Propellant

Very Rare10.7%✓ 29 Jun 2026

✓Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

Rare27.6%✓ 29 Jun 2026

✓Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

Ultra Rare3.3%✓ 29 Jun 2026

✓Unquestionably Ethical

Ultra Rare2.4%✓ 29 Jun 2026

✓Post-Mortem Interval

Find each member of the missing research teams.

Ultra Rare2.1%✓ 29 Jun 2026

✓The Plan

Ultra Rare2.5%✓ 29 Jun 2026

✓Following the Rules

Ultra Rare3.9%✓ 28 Jun 2026

✓Orbital Trajectory

Skip the opening Xen island with a secret jump.

Ultra Rare3.8%✓ 28 Jun 2026

✓xen when

Ultra Rare4.5%✓ 28 Jun 2026

✓Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Very Rare5.9%✓ 28 Jun 2026

✓Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.

Rare26.4%✓ 28 Jun 2026

✓Dead Reckoning

Kill an Assassin with the .357 Magnum.

Rare23.0%✓ 28 Jun 2026

✓Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Very Rare12.2%✓ 28 Jun 2026

✓Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Very Rare10.7%✓ 28 Jun 2026

✓One Step Ahead

Kill 10 Enemies with Tripmines.

Very Rare6.0%✓ 28 Jun 2026

✓Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Rare22.7%✓ 28 Jun 2026

✓Futile Resistance

Kill 10 Enemies with Snarks.

Very Rare7.0%✓ 27 Jun 2026

✓Universal Gravitation

Get killed by your own Snarks.

Very Rare10.6%✓ 27 Jun 2026

✓Quantum Capacitance

Overcharge it anyway.

Rare18.7%✓ 27 Jun 2026

✓Ethically Questionable

Conduct all of the questionable research experiments.

Very Rare5.3%✓ 27 Jun 2026

✓Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.

Uncommon36.6%✓ 27 Jun 2026

✓Remote Detonation

Kill a Barnacle with a Satchel.

Very Rare11.2%✓ 26 Jun 2026

✓Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Very Rare6.4%✓ 26 Jun 2026

✓Kinetic Repulsion

Kill a Marine with their own Grenade.

Very Rare6.0%✓ 26 Jun 2026

✓Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Very Rare8.8%✓ 26 Jun 2026

✓Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Very Rare13.4%✓ 26 Jun 2026

✓Permeable Infrastructure

Use the alternate path in Office Complex.

Rare23.3%✓ 26 Jun 2026

✓Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

Very Rare5.2%✓ 26 Jun 2026

✓Well-Done

Cook a Grenade for too long.

Rare18.8%✓ 26 Jun 2026

✓Mega Hertz

Kill 5 Enemies with one Grenade.

Rare18.7%✓ 26 Jun 2026

✓Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Uncommon33.2%✓ 25 Jun 2026

✓Inflammatory Actions

Kill a Headcrab using fire.

Rare25.6%✓ 25 Jun 2026

✓Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Rare21.0%✓ 25 Jun 2026

✓Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Very Rare9.5%✓ 25 Jun 2026

✓Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare16.3%✓ 25 Jun 2026

✓Convection Refinement

Ruin the microwave casserole.

Common50.2%✓ 25 Jun 2026

✓Brownian Motion

Pass the toilet paper to the Scientist in need.

Common61.0%✓ 25 Jun 2026