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21 of 50 (42%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 24 Feb, 2018 @ 12:18pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 24 Feb, 2018 @ 12:24pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 18 May, 2018 @ 2:06pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 4 Apr, 2018 @ 10:40am

Convection Refinement

Ruin the microwave casserole.
Unlocked 24 Feb, 2018 @ 12:16pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 19 Jul, 2018 @ 4:24pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 24 Feb, 2018 @ 7:11pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 6 Dec, 2019 @ 8:07pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 17 May, 2018 @ 6:54pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 7 Dec, 2019 @ 8:30am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 3 Apr, 2018 @ 5:35pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 24 Feb, 2018 @ 12:15pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 20 Jul, 2018 @ 10:12am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 24 Feb, 2018 @ 10:23pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 19 Jul, 2018 @ 7:40pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 5 Nov, 2021 @ 6:28pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 4 Jan, 2021 @ 3:24pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 22 Sep, 2020 @ 10:29pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 4 Jan, 2021 @ 6:51pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 4 Jan, 2021 @ 6:54pm

Well-Done

Cook a Grenade for too long.
Unlocked 28 Dec, 2020 @ 7:48am



Dead Reckoning

Kill an Assassin with the .357 Magnum.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Inflammatory Actions

Kill a Headcrab using fire.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Quantum Capacitance

Overcharge it anyway.

Resonance Procrastinator

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

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

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​​.

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.

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