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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked May 2, 2018 @ 2:58am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked May 2, 2018 @ 2:57am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked May 2, 2018 @ 7:00am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked May 11, 2018 @ 8:24am

Convection Refinement

Ruin the microwave casserole.
Unlocked May 2, 2018 @ 2:53am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked May 2, 2018 @ 10:41am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked May 2, 2018 @ 6:33am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked May 3, 2018 @ 7:00am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked May 11, 2018 @ 10:40am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked May 2, 2018 @ 6:43am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked May 11, 2018 @ 9:35am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked May 2, 2018 @ 3:20am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked May 2, 2018 @ 10:05am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked May 2, 2018 @ 6:15am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked May 11, 2018 @ 7:21am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked May 2, 2018 @ 3:55am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked May 11, 2018 @ 9:32am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked May 2, 2018 @ 3:20am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked May 2, 2018 @ 2:50am

Quantum Capacitance

Overcharge it anyway.
Unlocked May 3, 2018 @ 6:57am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked May 11, 2018 @ 10:31am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked May 2, 2018 @ 7:15am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked May 2, 2018 @ 3:09am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked May 2, 2018 @ 7:32am

Universal Gravitation

Get killed by your own Snarks.
Unlocked May 11, 2018 @ 8:32am



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