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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 23 Dec, 2017 @ 8:42pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 23 Dec, 2017 @ 9:48pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 26 Dec, 2017 @ 12:19am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 14 Jan, 2018 @ 5:27pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 23 Dec, 2017 @ 8:41pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 14 Jan, 2018 @ 4:59pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 16 Sep, 2018 @ 3:00pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 12 Apr, 2020 @ 9:09am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 23 Dec, 2017 @ 10:09pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 12 Apr, 2020 @ 8:35am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 23 Dec, 2017 @ 9:09pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 10 Apr, 2020 @ 9:17pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 12 Apr, 2020 @ 10:24am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 16 Sep, 2018 @ 2:30pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 12 Apr, 2020 @ 9:19am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 14 Jan, 2018 @ 4:38pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 15 Sep, 2018 @ 6:41pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 11 Apr, 2020 @ 7:02pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 12 Apr, 2020 @ 8:47am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 16 Sep, 2018 @ 1:16pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 11 Apr, 2020 @ 8:46pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 12 Apr, 2020 @ 8:37am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 7 Jun, 2021 @ 9:46am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 13 Apr, 2020 @ 11:28am

Well-Done

Cook a Grenade for too long.
Unlocked 12 Apr, 2020 @ 10:02am



Ethically Questionable

Conduct all of the questionable research experiments.

Mega Hertz

Kill 5 Enemies with one 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.

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.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked