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23 of 50 (46%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Oct 6, 2015 @ 3:46pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Oct 6, 2015 @ 5:26pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Feb 10 @ 5:16am

Convection Refinement

Ruin the microwave casserole.
Unlocked Oct 6, 2015 @ 3:42pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Feb 10 @ 4:08am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Oct 8, 2015 @ 6:40pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Oct 7, 2015 @ 2:53pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Feb 10 @ 4:20am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Feb 5 @ 8:10pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Apr 2, 2023 @ 6:57pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Jul 22, 2021 @ 6:08am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Apr 3, 2023 @ 12:30pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Feb 2 @ 5:00pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Oct 6, 2015 @ 3:35pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Feb 6 @ 1:48am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Feb 10 @ 5:16am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Apr 3, 2023 @ 12:51pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Feb 10 @ 3:36am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Feb 5 @ 8:01pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Feb 10 @ 5:22am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Apr 3, 2023 @ 11:24am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Apr 3, 2023 @ 1:18pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Apr 3, 2023 @ 1:23pm



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

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.

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.

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.​

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked