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37 of 50 (74%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 3 Aug, 2020 @ 6:33am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 26 Nov, 2021 @ 1:58am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 29 Nov, 2021 @ 10:23am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 4 Dec, 2021 @ 5:00am

Convection Refinement

Ruin the microwave casserole.
Unlocked 3 Aug, 2020 @ 6:32am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 26 Nov, 2021 @ 9:25am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 29 Nov, 2021 @ 11:00pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 19 May, 2023 @ 4:34am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 2 Dec, 2021 @ 6:43am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 27 Nov, 2021 @ 2:40am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 17 Dec, 2021 @ 12:14am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 29 Nov, 2021 @ 2:26am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 29 Nov, 2021 @ 11:06pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 2 Dec, 2021 @ 8:03am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 6 Dec, 2021 @ 4:40am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 26 Nov, 2021 @ 1:36am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 27 Nov, 2021 @ 12:34pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 29 Nov, 2021 @ 2:21am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 29 Nov, 2021 @ 1:11am

Quantum Capacitance

Overcharge it anyway.
Unlocked 2 Dec, 2021 @ 6:45am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 17 Dec, 2021 @ 12:40am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 1 Dec, 2021 @ 12:37am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 29 Nov, 2021 @ 2:17am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 30 Nov, 2021 @ 2:40am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 2 Dec, 2021 @ 2:07am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 28 Nov, 2021 @ 4:46am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 30 Nov, 2021 @ 11:56pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 6 Dec, 2021 @ 4:21am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 29 Nov, 2021 @ 10:45am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 19 May, 2024 @ 5:45am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 17 Dec, 2021 @ 12:44am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 12 Sep, 2022 @ 11:41pm

Contest Propellant

Find the snack supply canister.
Unlocked 27 Apr, 2022 @ 10:28am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 27 Nov, 2021 @ 11:40am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 28 Nov, 2021 @ 5:43am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 28 Nov, 2021 @ 5:42am

Well-Done

Cook a Grenade for too long.
Unlocked 29 Nov, 2021 @ 11:21pm



Prolific Popper

Kill all Protozoans in the Borderworld.

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

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.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked