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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 12 Nov, 2021 @ 4:48pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 16 Dec, 2023 @ 9:23am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 23 Nov, 2021 @ 1:35pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 12 Nov, 2021 @ 4:47pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 3 Dec, 2022 @ 2:26am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 16 Dec, 2023 @ 9:51am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 13 Dec, 2023 @ 11:13am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 27 Nov, 2021 @ 12:48pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 16 Dec, 2023 @ 9:15am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 16 Dec, 2023 @ 10:12am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 12 Nov, 2021 @ 5:34pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 28 Nov, 2021 @ 12:25pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 4 Dec, 2022 @ 4:39am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 12 Nov, 2021 @ 4:46pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 16 Dec, 2023 @ 9:46am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 27 Nov, 2021 @ 1:10pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 16 Dec, 2023 @ 9:07am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 28 Nov, 2021 @ 12:39pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 4 Dec, 2022 @ 8:47am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 3 Dec, 2022 @ 8:03am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 4 Dec, 2022 @ 5:51am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 28 Nov, 2021 @ 8:15am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 28 Nov, 2021 @ 8:44am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 28 Nov, 2021 @ 8:53am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 14 Dec, 2023 @ 1:08pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 14 Dec, 2023 @ 1:11pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 6 Dec, 2021 @ 12:08pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 4 Dec, 2022 @ 9:28am

Well-Done

Cook a Grenade for too long.
Unlocked 23 Nov, 2021 @ 12:48pm



Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Dead Reckoning

Kill an Assassin with the .357 Magnum.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Rare Specimen

Send the Hidden Hat to Xen.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans 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.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked