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25 of 50 (50%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Jan 31, 2016 @ 6:54am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Nov 18, 2017 @ 12:34pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Nov 17, 2017 @ 2:46pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Feb 1, 2016 @ 3:56pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Jan 31, 2016 @ 6:53am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Jul 7, 2018 @ 10:39am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Jan 31, 2016 @ 9:07am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Feb 14, 2016 @ 12:20pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Jan 31, 2016 @ 7:24am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Jun 30, 2018 @ 12:06pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Jan 31, 2016 @ 8:26am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Feb 14, 2016 @ 12:17pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Feb 14, 2016 @ 12:33pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Jan 31, 2016 @ 1:03pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Jan 31, 2016 @ 12:44pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Nov 19, 2017 @ 6:25am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Apr 25, 2023 @ 3:08pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Feb 11, 2020 @ 12:48pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Apr 22, 2023 @ 7:17am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Feb 26, 2022 @ 1:48am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Apr 23, 2023 @ 2:19pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Apr 25, 2023 @ 1:40pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Apr 30, 2023 @ 5:50am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Apr 30, 2023 @ 5:49am

Well-Done

Cook a Grenade for too long.
Unlocked Feb 26, 2022 @ 5:42am



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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

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.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked