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29 of 50 (58%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 23 Aug, 2020 @ 12:21am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 30 Oct, 2021 @ 2:32pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 28 Oct, 2021 @ 11:47am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 24 Oct, 2021 @ 4:37am

Convection Refinement

Ruin the microwave casserole.
Unlocked 23 Aug, 2020 @ 12:19am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 24 Oct, 2021 @ 11:17am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 30 Oct, 2021 @ 2:32pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 25 Oct, 2021 @ 10:53am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 24 Oct, 2021 @ 11:28am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 19 Oct, 2021 @ 9:11am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 27 Oct, 2021 @ 9:13am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 27 Oct, 2021 @ 8:11am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 22 Sep, 2020 @ 8:27am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 24 Oct, 2021 @ 11:25am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 24 Oct, 2021 @ 10:46am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 23 Aug, 2020 @ 12:13am

Quantum Capacitance

Overcharge it anyway.
Unlocked 30 Oct, 2021 @ 2:26pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 23 Oct, 2021 @ 10:48am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 30 Oct, 2021 @ 3:34pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 30 Oct, 2021 @ 1:50pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 24 Oct, 2021 @ 10:29am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 30 Oct, 2021 @ 3:31pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 30 Oct, 2021 @ 3:38pm

Contest Propellant

Find the snack supply canister.
Unlocked 30 Oct, 2021 @ 12:00pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 30 Oct, 2021 @ 2:32pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 30 Oct, 2021 @ 11:57am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 30 Oct, 2021 @ 2:19pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 30 Oct, 2021 @ 2:24pm

Well-Done

Cook a Grenade for too long.
Unlocked 30 Oct, 2021 @ 2:26pm



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

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.

Universal Gravitation

Get killed by your own Snarks.

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.

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.

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