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26 of 50 (52%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 9 Feb, 2016 @ 4:19am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 30 Apr, 2020 @ 1:37am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 4 Aug, 2019 @ 4:10am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 10 Feb, 2016 @ 8:04am

Convection Refinement

Ruin the microwave casserole.
Unlocked 9 Feb, 2016 @ 4:18am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 3 Apr, 2023 @ 9:51am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 9 Feb, 2016 @ 7:43am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 4 Aug, 2019 @ 12:21am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 11 Nov, 2023 @ 5:19am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 19 Jul, 2016 @ 12:44am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 4 Aug, 2019 @ 4:14am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 17 Feb, 2016 @ 12:09pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 4 Aug, 2019 @ 5:09am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 4 Mar, 2016 @ 1:23am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 24 Mar, 2023 @ 8:20am

Quantum Capacitance

Overcharge it anyway.
Unlocked 10 Apr, 2023 @ 4:09am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 9 Feb, 2016 @ 11:32am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 29 Nov, 2020 @ 3:25am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 11 Nov, 2023 @ 5:40am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 15 Sep, 2023 @ 11:57am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 10 Apr, 2023 @ 3:34am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 14 Sep, 2023 @ 7:33am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 11 Nov, 2023 @ 4:49am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 15 Sep, 2023 @ 10:36am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 15 Sep, 2023 @ 12:20pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 11 Nov, 2023 @ 5:51am



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Rare Specimen

Send the Hidden Hat to Xen.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.​

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked