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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 30 Dec, 2016 @ 4:37pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 16 Apr, 2020 @ 4:18pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 23 Apr, 2020 @ 9:00am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 18 Apr, 2020 @ 12:26pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 30 Dec, 2016 @ 4:34pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 17 Oct, 2024 @ 2:06pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 18 Apr, 2020 @ 11:35am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 17 Oct, 2024 @ 5:26pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 30 Dec, 2016 @ 5:23pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 17 Oct, 2024 @ 5:02pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 23 Apr, 2020 @ 9:31am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 23 Apr, 2020 @ 9:07am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 30 Dec, 2016 @ 6:15pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 25 Apr, 2020 @ 11:51am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 17 Oct, 2024 @ 12:40pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 30 Dec, 2016 @ 4:23pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 16 Apr, 2020 @ 5:25pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 16 Oct, 2024 @ 11:03pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 17 Oct, 2024 @ 4:30pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 18 Apr, 2020 @ 12:10pm

Contest Propellant

Find the snack supply canister.
Unlocked 25 Apr, 2020 @ 10:26am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 25 Apr, 2020 @ 10:38am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 25 Apr, 2020 @ 10:20am

Well-Done

Cook a Grenade for too long.
Unlocked 18 Apr, 2020 @ 2:58pm



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Quantum Capacitance

Overcharge it anyway.

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​​.

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.

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.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked