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27 of 50 (54%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 26 Aug, 2017 @ 9:17pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 26 Aug, 2017 @ 9:16pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 30 Mar, 2020 @ 8:41pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 28 Dec, 2024 @ 10:05pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 27 Aug, 2017 @ 7:17pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 29 Nov, 2023 @ 9:39pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 27 Aug, 2017 @ 11:45am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 27 Dec, 2024 @ 8:21pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 29 Nov, 2023 @ 10:23am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 27 Aug, 2017 @ 7:38pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 27 Aug, 2017 @ 11:13am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 2 Dec, 2023 @ 12:22pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 29 Nov, 2023 @ 9:15pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 27 Dec, 2024 @ 7:50pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 2 Apr, 2020 @ 1:10pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 2 Apr, 2020 @ 3:13pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 27 Dec, 2024 @ 8:04pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 29 Nov, 2023 @ 9:33pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 2 Dec, 2023 @ 9:36pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 1 Dec, 2023 @ 12:51am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 29 Nov, 2023 @ 11:10am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 27 Dec, 2024 @ 8:02pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 2 Dec, 2023 @ 5:12pm

Contest Propellant

Find the snack supply canister.
Unlocked 2 Dec, 2023 @ 6:36pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 2 Dec, 2023 @ 6:33pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 3 Dec, 2023 @ 4:14pm

Well-Done

Cook a Grenade for too long.
Unlocked 28 Dec, 2024 @ 10:06pm



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own 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​​.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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​.

Late for Work

Defeat Nihilanth in under 4 minutes.​

Rather an Anticlimax

Decline G-Man’s offer of employment.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked