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33 of 50 (66%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 23 Apr, 2024 @ 12:27am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 22 Oct, 2024 @ 12:43am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 21 Oct, 2024 @ 11:47pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 22 Oct, 2024 @ 2:20am

Convection Refinement

Ruin the microwave casserole.
Unlocked 23 Apr, 2024 @ 12:26am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 22 Oct, 2024 @ 2:12am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 22 Oct, 2024 @ 4:58am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 21 Oct, 2024 @ 11:02pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 21 Oct, 2024 @ 12:10am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 21 Oct, 2024 @ 2:40am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 22 Oct, 2024 @ 2:26am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 19 Oct, 2024 @ 12:38pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 22 Oct, 2024 @ 5:01am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 21 Oct, 2024 @ 4:03am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 17 Oct, 2024 @ 11:16pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 13 Oct, 2024 @ 11:13pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 17 Oct, 2024 @ 10:38pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 4 Oct, 2024 @ 1:54am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 13 Oct, 2024 @ 10:20pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 21 Oct, 2024 @ 2:46am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 16 Oct, 2024 @ 11:13pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 13 Oct, 2024 @ 10:28pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 22 Oct, 2024 @ 5:11am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 21 Oct, 2024 @ 2:51am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 22 Oct, 2024 @ 4:30am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 22 Oct, 2024 @ 1:24am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 21 Oct, 2024 @ 2:22am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 21 Oct, 2024 @ 4:51am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 22 Oct, 2024 @ 12:36am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 21 Oct, 2024 @ 10:34pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 17 Oct, 2024 @ 10:50pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 17 Oct, 2024 @ 10:49pm

Well-Done

Cook a Grenade for too long.
Unlocked 16 Oct, 2024 @ 11:07pm



Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

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.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked