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23 of 50 (46%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 11 May, 2023 @ 9:51am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 13 May, 2023 @ 10:44pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 13 May, 2023 @ 10:25pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 11 May, 2023 @ 9:48am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 11 May, 2023 @ 9:20pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 11 May, 2023 @ 8:36pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 11 May, 2023 @ 10:38am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 11 May, 2023 @ 8:12pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 14 May, 2023 @ 12:19pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 11 May, 2023 @ 10:49am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 13 May, 2023 @ 11:15pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 11 May, 2023 @ 10:07am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 14 May, 2023 @ 1:41pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 13 May, 2023 @ 10:19pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 14 May, 2023 @ 1:00pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 13 May, 2023 @ 10:39pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 11 May, 2023 @ 10:00am

Contest Propellant

Find the snack supply canister.
Unlocked 14 May, 2023 @ 11:39am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 14 May, 2023 @ 11:38am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 14 May, 2023 @ 1:26pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 14 May, 2023 @ 1:22pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 14 May, 2023 @ 1:21pm

Well-Done

Cook a Grenade for too long.
Unlocked 11 May, 2023 @ 10:22am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

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.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Mega Hertz

Kill 5 Enemies with one Grenade.

Quantum Capacitance

Overcharge it anyway.

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.

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.

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​.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked