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31 of 50 (62%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 29 Jun, 2024 @ 6:55pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 20 Jan @ 2:06pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 18 Jan @ 7:15pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 29 Jun, 2024 @ 6:54pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 1 Jul, 2024 @ 2:16pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 24 Jan @ 1:44pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 27 Nov, 2024 @ 3:56pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 7 Dec, 2024 @ 2:00pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 20 Jan @ 12:52pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 20 Jan @ 1:19pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 18 Jan @ 3:40pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 26 Nov, 2024 @ 11:39am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 19 Jan @ 8:44pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 20 Jan @ 12:57pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 29 Jun, 2024 @ 6:47pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 27 Nov, 2024 @ 2:33pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 1 Jul, 2024 @ 1:59pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 20 Jan @ 1:41pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 21 Jan @ 10:12pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 19 Jan @ 8:36pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 18 Jan @ 2:47pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 20 Jan @ 1:37pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 21 Jan @ 10:01pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 18 Jan @ 8:23pm

Contest Propellant

Find the snack supply canister.
Unlocked 18 Jan @ 8:33pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 18 Jan @ 8:31pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 24 Jan @ 2:16pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 24 Jan @ 2:13pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 19 Jan @ 9:21pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 19 Jan @ 9:16pm

Well-Done

Cook a Grenade for too long.
Unlocked 19 Jan @ 8:03pm



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.

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​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

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.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked