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29 of 50 (58%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 6 Jan, 2018 @ 12:39pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 10 Jan, 2018 @ 2:34am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 10 Jan, 2018 @ 1:44am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 13 Jan, 2018 @ 4:21pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 6 Jan, 2018 @ 12:36pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 10 Jan, 2018 @ 1:52pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 14 Jan, 2018 @ 11:29am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 11 Jan, 2018 @ 11:44am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 14 Jan, 2018 @ 11:22am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 9 Jan, 2018 @ 6:45am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 14 Jan, 2018 @ 12:22pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 11 Jan, 2018 @ 11:35am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 11 Jan, 2018 @ 11:55am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 14 Jan, 2018 @ 11:16am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 11 Jan, 2018 @ 12:03pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 9 Jan, 2018 @ 6:08am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 14 Jan, 2018 @ 12:17pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 10 Jan, 2018 @ 1:41am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 4 Jun @ 7:53am

Quantum Capacitance

Overcharge it anyway.
Unlocked 11 Jan, 2018 @ 11:40am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 10 Jan, 2018 @ 2:04am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 4 Jun @ 8:05am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 5 Nov @ 11:35am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 11 Jan, 2018 @ 11:33am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 4 Jun @ 2:05pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 4 Nov @ 3:23pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 5 Nov @ 10:49am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 4 Jun @ 8:02am

Well-Done

Cook a Grenade for too long.
Unlocked 4 Jun @ 8:55am



Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.​

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.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked