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29 of 50 (58%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 3 Jul, 2016 @ 11:55am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 6 Jul, 2016 @ 2:39am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 6 Jul, 2016 @ 3:27am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 10 Dec, 2016 @ 11:03am

Convection Refinement

Ruin the microwave casserole.
Unlocked 3 Jul, 2016 @ 11:54am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 2 Jan @ 11:44pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 3 Jan @ 7:25am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 6 Jul, 2016 @ 2:47am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 2 Jan @ 11:51pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 3 Jan @ 12:07am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 3 Jan @ 7:23am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 30 Jan, 2020 @ 6:56am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 3 Jan @ 12:06am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 3 Jul, 2016 @ 12:55pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 2 Jan @ 11:49pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 6 Jul, 2016 @ 3:12am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 2 Jan @ 11:30pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 27 Jan, 2019 @ 6:43am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 3 Jan @ 12:03am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 2 Jan @ 11:40pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 3 Jan @ 7:23am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 3 Jan @ 8:19am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 2 Jan @ 11:37pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 4 Jan @ 1:40am

Following the Rules

Use the welcome mat.
Unlocked 4 Jan @ 1:47am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 15 Dec, 2020 @ 8:56am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 15 Dec, 2020 @ 11:56am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 2 Jan @ 11:56pm

Well-Done

Cook a Grenade for too long.
Unlocked 2 Jan @ 10:25am



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Rare Specimen

Send the Hidden Hat to Xen.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts 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.

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.

Laser Immunization

Complete Interloper without taking any laser damage.

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.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked