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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked May 3, 2018 @ 2:17pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Jul 2, 2019 @ 6:39pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Jul 2, 2019 @ 11:08am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Jul 2, 2019 @ 3:30pm

Convection Refinement

Ruin the microwave casserole.
Unlocked May 3, 2018 @ 2:15pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Jul 2, 2019 @ 6:46pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Jul 2, 2019 @ 1:33pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Jul 22, 2018 @ 3:24pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Jul 2, 2019 @ 8:48pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Sep 7, 2023 @ 1:17pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jul 3, 2019 @ 10:40am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Sep 4, 2023 @ 6:26am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jul 2, 2019 @ 8:44pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Jul 2, 2019 @ 12:50pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Sep 4, 2023 @ 5:06am

Quantum Capacitance

Overcharge it anyway.
Unlocked Jul 2, 2019 @ 1:29pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Jul 2, 2019 @ 9:55pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Jul 2, 2019 @ 8:51pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Jul 2, 2019 @ 1:24pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Sep 8, 2023 @ 3:39am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Sep 7, 2023 @ 10:21am

Contest Propellant

Find the snack supply canister.
Unlocked Sep 8, 2023 @ 2:16am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Mar 25, 2020 @ 9:30am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Sep 8, 2023 @ 4:25am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Sep 8, 2023 @ 4:24am



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

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​​.

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.

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.

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.​

Well-Done

Cook a Grenade for too long.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked