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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Jan 2, 2017 @ 5:47pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Jan 11, 2017 @ 7:12pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Sep 19, 2017 @ 6:01pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Jan 24, 2017 @ 4:17pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Jan 2, 2017 @ 5:46pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Jan 24, 2017 @ 5:30pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Aug 18, 2017 @ 4:31pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Sep 18, 2017 @ 6:20pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jun 17, 2021 @ 3:28am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Sep 14, 2017 @ 5:30pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Dec 10, 2019 @ 8:25pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Sep 26, 2021 @ 4:30pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Jan 2, 2017 @ 5:38pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Dec 10, 2019 @ 8:00pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Nov 27, 2019 @ 6:32pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Jun 20, 2021 @ 3:24pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Jun 5, 2021 @ 1:50am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Sep 26, 2021 @ 4:15pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked May 5 @ 1:15pm

Contest Propellant

Find the snack supply canister.
Unlocked Jun 19, 2021 @ 3:26pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Jun 19, 2021 @ 3:22pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked Jun 20, 2021 @ 3:52pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Jun 20, 2021 @ 3:58pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Jun 20, 2021 @ 4:10pm



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.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

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.

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.

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