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20 of 50 (40%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Dec 24, 2016 @ 11:31pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Jan 11, 2017 @ 10:05pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Mar 19, 2020 @ 2:04pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Dec 24, 2016 @ 11:29pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Mar 24, 2020 @ 7:57pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Dec 30, 2016 @ 11:40pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Dec 24, 2016 @ 11:50pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jan 29, 2022 @ 10:47pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Mar 18, 2020 @ 5:46pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Mar 24, 2020 @ 11:48pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Dec 29, 2016 @ 10:58pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Jan 30, 2022 @ 10:48pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Jan 30, 2022 @ 10:55pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Mar 24, 2020 @ 11:39pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Jan 21, 2022 @ 10:13pm

Contest Propellant

Find the snack supply canister.
Unlocked Mar 24, 2020 @ 10:32pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Mar 24, 2020 @ 10:29pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Mar 25, 2020 @ 12:09am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Mar 25, 2020 @ 12:08am

Well-Done

Cook a Grenade for too long.
Unlocked Mar 19, 2020 @ 2:50pm



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

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.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

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.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked