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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Aug 13, 2015 @ 7:56pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Aug 13, 2015 @ 9:30pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Oct 30, 2016 @ 3:16am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Nov 1, 2016 @ 12:31am

Convection Refinement

Ruin the microwave casserole.
Unlocked Aug 13, 2015 @ 7:56pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Oct 30, 2016 @ 4:26am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Aug 14, 2015 @ 4:05am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Aug 31, 2017 @ 12:02am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Aug 13, 2015 @ 10:39pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Sep 6, 2017 @ 7:48pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Apr 11, 2017 @ 11:45pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Aug 31, 2017 @ 12:01am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Sep 4, 2015 @ 12:20am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Aug 13, 2015 @ 9:13pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Aug 15, 2015 @ 3:30am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Aug 16, 2015 @ 4:02am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Aug 13, 2015 @ 7:53pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Aug 16, 2015 @ 11:58pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Sep 6, 2017 @ 8:36pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Jun 1, 2018 @ 11:01pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Dec 6, 2017 @ 3:38pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Aug 31, 2017 @ 12:03am



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Remote Detonation

Kill a Barnacle with a Satchel.

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​​.

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.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked