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19 of 50 (38%) achievements earned:
Personal Achievements

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Jan 27, 2016 @ 10:15am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Jan 27, 2016 @ 10:33am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Dec 10, 2022 @ 2:12pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Jan 27, 2016 @ 10:13am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked May 10, 2020 @ 10:32am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Dec 10, 2022 @ 1:25pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Jan 28, 2016 @ 9:39am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Jan 27, 2016 @ 11:08am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Jan 27, 2016 @ 12:04pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Dec 17, 2022 @ 12:52pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Jan 28, 2016 @ 10:41am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Jan 27, 2016 @ 10:06am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Dec 18, 2022 @ 7:37am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Dec 10, 2022 @ 1:31pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Apr 27, 2020 @ 12:12pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked Dec 18, 2022 @ 7:37am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Dec 17, 2022 @ 1:15pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Dec 18, 2022 @ 8:13am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Dec 18, 2022 @ 8:12am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Resonance Procrastinator

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

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Our Brains And Your Brawn

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

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

Gonad Glider

Get whacked into oblivion in the ledge fight.

Post-Mortem Interval

Find each member of the missing research teams.

Black Mesa Decathlon Winner

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

Specimen GG

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

Late for Work

Defeat Nihilanth in under 4 minutes.​


Cook a Grenade for too long.

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked