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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 16 Apr, 2017 @ 1:58pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 16 Apr, 2017 @ 3:18pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 27 Nov, 2023 @ 12:09am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 18 Apr, 2017 @ 8:42pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 16 Apr, 2017 @ 1:55pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 28 Nov, 2023 @ 11:55am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 18 Apr, 2017 @ 9:30pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 18 Apr, 2017 @ 8:52pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 16 Apr, 2017 @ 4:51pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 16 Apr, 2017 @ 3:22pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 7 Sep, 2020 @ 12:53pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 16 Apr, 2017 @ 4:09pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 8 Sep, 2020 @ 12:27pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 17 Apr, 2017 @ 6:23pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 1 Sep, 2020 @ 3:57pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 1 Sep, 2020 @ 9:39am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 17 Apr, 2017 @ 6:22pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 8 Sep, 2020 @ 12:21pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 1 Sep, 2020 @ 2:13pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 27 Nov, 2023 @ 12:17am

Contest Propellant

Find the snack supply canister.
Unlocked 8 Sep, 2020 @ 11:03am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 8 Sep, 2020 @ 11:00am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 8 Sep, 2020 @ 1:03pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 8 Sep, 2020 @ 1:02pm



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.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans in the Borderworld.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

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.​

Well-Done

Cook a Grenade for too long.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked