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40 of 50 (80%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 2 Nov, 2016 @ 2:41pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 2 Nov, 2016 @ 5:35pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 8 Nov, 2016 @ 1:27pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 10 Nov, 2016 @ 12:25pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 2 Nov, 2016 @ 2:39pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 8 Nov, 2016 @ 1:45pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 15 Jan, 2017 @ 12:16pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 9 Nov, 2016 @ 7:18am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 15 Jan, 2017 @ 1:46pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 6 Nov, 2016 @ 8:24am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 16 Nov, 2016 @ 11:11am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 25 Nov, 2016 @ 5:45pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 6 Nov, 2016 @ 10:49am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 10 Nov, 2016 @ 8:55am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 15 Jan, 2017 @ 11:42am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 5 Nov, 2016 @ 5:18pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 16 Nov, 2016 @ 10:34am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 6 Nov, 2016 @ 8:45am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 2 Nov, 2016 @ 2:32pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 10 Nov, 2016 @ 8:33am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 31 Mar, 2017 @ 7:16am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 15 Jan, 2017 @ 11:37am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 15 Jan, 2017 @ 11:21am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 15 Jan, 2017 @ 12:34pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 10 Nov, 2016 @ 8:58am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 8 Dec, 2020 @ 6:01pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 25 May, 2020 @ 10:36am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 26 May, 2020 @ 6:23pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 5 Jun, 2020 @ 7:57pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 23 May, 2020 @ 8:04pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 23 May, 2020 @ 6:48pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 23 May, 2020 @ 6:39pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 8 Dec, 2020 @ 1:42pm

Contest Propellant

Find the snack supply canister.
Unlocked 8 Dec, 2020 @ 3:05pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 8 Dec, 2020 @ 3:01pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 9 Dec, 2020 @ 8:04pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 9 Dec, 2020 @ 8:05pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 9 Dec, 2020 @ 7:57pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 9 Dec, 2020 @ 7:56pm

Well-Done

Cook a Grenade for too long.
Unlocked 23 May, 2020 @ 10:02am



Prolific Popper

Kill all Protozoans in the Borderworld.

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.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked