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36 of 50 (72%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 30 Apr, 2017 @ 2:46pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 13 Jun, 2017 @ 3:44pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 4 Jul, 2017 @ 3:01am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 1 May, 2017 @ 7:59am

Convection Refinement

Ruin the microwave casserole.
Unlocked 30 Apr, 2017 @ 2:44pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 1 May, 2017 @ 2:54am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 14 Jul, 2017 @ 4:20pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 14 Jul, 2017 @ 3:26am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 15 Jun, 2017 @ 4:54am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 1 May, 2017 @ 3:18am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 15 Jun, 2017 @ 7:42am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 14 Jul, 2017 @ 3:13am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 14 Jul, 2017 @ 4:27pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 26 May, 2017 @ 1:39pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 14 Jun, 2017 @ 2:54pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 14 Jul, 2017 @ 4:08pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 14 Jul, 2017 @ 3:31pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 14 Jul, 2017 @ 4:13pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 14 Jun, 2017 @ 3:08pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 14 Jun, 2017 @ 2:53pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 15 Jun, 2017 @ 8:15am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 14 Jul, 2017 @ 4:03pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 14 Jun, 2017 @ 3:05pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 13 May, 2017 @ 5:01pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 14 Jun, 2017 @ 2:37pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 21 Apr, 2020 @ 5:56pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 14 Mar, 2020 @ 2:52pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 19 Jun, 2022 @ 2:02pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 13 Mar, 2020 @ 6:25pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 17 Feb, 2020 @ 7:43am

Contest Propellant

Find the snack supply canister.
Unlocked 13 Feb, 2021 @ 5:22am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 21 Apr, 2020 @ 5:14pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 9 Feb, 2020 @ 10:06am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 21 Apr, 2020 @ 6:17pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 19 Jun, 2022 @ 6:13pm

Well-Done

Cook a Grenade for too long.
Unlocked 19 Jun, 2022 @ 10:26am



Prolific Popper

Kill all Protozoans in the Borderworld.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

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