Black Mesa — Overachiever

Brownian Motion

Pass the toilet paper to the Scientist in need.

Unlocked: 2023-07-12

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Convection Refinement

Ruin the microwave casserole.

Unlocked: 2023-07-12

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Rather an Anticlimax

Decline G-Man’s offer of employment.

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Anti-Matter Over Mind

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

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Our Brains And Your Brawn

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

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Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

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Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

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Centripetal Attraction

Kill 20 Enemies with the Hivehand.

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Premature Expulsion

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

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Contest Propellant

Hidden achievement.

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Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

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Dead Reckoning

Kill an Assassin with the .357 Magnum.

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Black Mesa Decathlon Winner

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

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Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

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Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

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Ethically Questionable

Conduct all of the questionable research experiments.

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Following the Rules

Hidden achievement.

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Universal Gravitation

Get killed by your own Snarks.

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Gonad Glider

Get whacked into oblivion in the ledge fight.

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Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.

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Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

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Remote Detonation

Kill a Barnacle with a Satchel.

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Inflammatory Actions

Kill a Headcrab using fire.

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Kinetic Repulsion

Kill a Marine with their own Grenade.

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Laser Immunization

Complete Interloper without taking any laser damage.

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Late for Work

Defeat Nihilanth in under 4 minutes.

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Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

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Limitless Potential

Accept G-Man’s offer of employment.

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Futile Resistance

Kill 10 Enemies with Snarks.

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Mega Hertz

Kill 5 Enemies with one Grenade.

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Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

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One Step Ahead

Kill 10 Enemies with Tripmines.

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Orbital Trajectory

Skip the opening Xen island with a secret jump.

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Permeable Infrastructure

Use the alternate path in Office Complex.

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PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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Post-Mortem Interval

Find each member of the missing research teams.

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Pepperoni Precipitation

Hidden achievement.

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Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

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Prolific Popper

Kill all Protozoans in the Borderworld.

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Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

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Quantum Capacitance

Overcharge it anyway.

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The Rarest Specimen

Hidden achievement.

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Rare Specimen

Send the Hidden Hat to Xen.

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Resonance Procrastinator

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

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Specimen GG

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

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Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

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The Plan

Hidden achievement.

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Unquestionably Ethical

Hidden achievement.

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Well-Done

Cook a Grenade for too long.

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xen when

Hidden achievement.

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🏆 Black Mesa