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22 of 50 (44%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 17 Feb, 2017 @ 3:59pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 1 Aug, 2017 @ 7:05pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 19 Feb, 2017 @ 10:13am

Convection Refinement

Ruin the microwave casserole.
Unlocked 17 Feb, 2017 @ 3:58pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 17 Feb, 2017 @ 6:03pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 17 Feb, 2017 @ 4:28pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 19 Feb, 2017 @ 10:41am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 6 Nov, 2019 @ 10:46am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 7 Nov, 2019 @ 10:15am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 17 Feb, 2017 @ 4:51pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 17 Feb, 2017 @ 3:52pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 12 Dec, 2019 @ 6:46pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 30 Aug, 2022 @ 12:55am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 2 Aug, 2017 @ 2:18pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 30 Aug, 2022 @ 8:39am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 30 Aug, 2022 @ 9:10am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 30 Aug, 2022 @ 9:19am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 30 Aug, 2022 @ 5:39am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 30 Aug, 2022 @ 9:09am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 30 Aug, 2022 @ 9:12am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 30 Aug, 2022 @ 9:15am

Well-Done

Cook a Grenade for too long.
Unlocked 30 Aug, 2022 @ 9:16am



Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Dead Reckoning

Kill an Assassin with the .357 Magnum.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

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.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Our Brains And Your Brawn

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

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

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​.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked