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26 of 50 (52%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 9 Jan, 2024 @ 4:39am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 11 Sep, 2024 @ 4:12am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 10 Sep, 2024 @ 4:58am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 10 Sep, 2024 @ 4:15am

Convection Refinement

Ruin the microwave casserole.
Unlocked 9 Jan, 2024 @ 4:37am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 10 Jan, 2024 @ 9:28pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 10 Sep, 2024 @ 5:06am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 11 Sep, 2024 @ 3:55am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 15 Sep, 2024 @ 3:49am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 15 Sep, 2024 @ 9:11pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 11 Sep, 2024 @ 4:57am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 9 Jan, 2024 @ 6:06am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 15 Sep, 2024 @ 10:14pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 9 Jan, 2024 @ 6:44pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 15 Sep, 2024 @ 11:50pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 15 Sep, 2024 @ 10:21pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 10 Sep, 2024 @ 3:44am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 9 Jan, 2024 @ 5:01am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 10 Sep, 2024 @ 4:24am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 11 Sep, 2024 @ 4:02am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 9 Jan, 2024 @ 4:57am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 15 Sep, 2024 @ 9:18pm

Contest Propellant

Find the snack supply canister.
Unlocked 15 Sep, 2024 @ 9:32pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 15 Sep, 2024 @ 9:30pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 15 Sep, 2024 @ 11:45pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 15 Sep, 2024 @ 11:45pm



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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

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.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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.​

Well-Done

Cook a Grenade for too long.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked