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25 of 50 (50%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 5 Dec, 2020 @ 12:57pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 4 Apr, 2023 @ 1:39pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 2 Apr @ 9:26am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 6 Apr, 2023 @ 8:38am

Convection Refinement

Ruin the microwave casserole.
Unlocked 5 Dec, 2020 @ 12:56pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 6 Apr, 2023 @ 6:52am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 6 Apr, 2023 @ 4:20am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 23 Dec, 2020 @ 6:57am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 5 Dec, 2020 @ 1:38pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 22 Dec, 2020 @ 7:41am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 4 Apr, 2023 @ 3:25pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 24 Dec, 2020 @ 1:46pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 5 Dec, 2020 @ 12:52pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 7 Apr, 2023 @ 5:55am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 5 Apr @ 7:04am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 24 Dec, 2020 @ 1:41pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 6 Apr, 2023 @ 4:32am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 7 Apr, 2023 @ 2:50am

Contest Propellant

Find the snack supply canister.
Unlocked 24 Dec, 2020 @ 11:26am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 6 Apr @ 1:22pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 24 Dec, 2020 @ 11:24am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 6 Apr @ 1:41pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 5 Dec, 2020 @ 12:41pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 7 Apr, 2023 @ 9:33am

Well-Done

Cook a Grenade for too long.
Unlocked 2 Apr @ 8:29am



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Resonance Procrastinator

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

Universal Gravitation

Get killed by your own Snarks.

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.​

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

Post-Mortem Interval

Find each member of the missing research teams.

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.

Late for Work

Defeat Nihilanth in under 4 minutes.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked