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24 of 50 (48%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 3 May, 2018 @ 3:22pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 4 May, 2018 @ 4:27am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 19 Jun, 2018 @ 6:06am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 1 Jun, 2018 @ 4:39pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 3 May, 2018 @ 3:20pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 18 Jun, 2018 @ 7:03pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 19 Jun, 2018 @ 7:52pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 4 May, 2018 @ 2:50pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 21 Jun, 2018 @ 9:27am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 19 Jun, 2018 @ 7:46pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 15 Apr, 2020 @ 7:24pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 28 Jan, 2019 @ 9:29am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 20 Jun, 2018 @ 7:32pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 3 May, 2018 @ 4:05pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 17 Jun, 2018 @ 8:27pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 4 May, 2018 @ 3:59pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 1 Feb, 2019 @ 1:48pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 21 Jun, 2018 @ 9:14am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 20 Jun, 2018 @ 7:29pm

Contest Propellant

Find the snack supply canister.
Unlocked 6 Nov, 2023 @ 3:44am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 11 Feb, 2021 @ 8:53am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 11 Nov, 2023 @ 5:31pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 11 Nov, 2023 @ 5:30pm

Well-Done

Cook a Grenade for too long.
Unlocked 31 Oct, 2023 @ 3:48am



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.

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.

PhD in Pacifism

Don't kill any Vortigaunts 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.

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.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked