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26 of 50 (52%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 26 Nov, 2016 @ 9:38pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 26 Nov, 2016 @ 10:28pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 20 Mar, 2017 @ 2:30am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 15 Dec, 2016 @ 8:36pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 26 Nov, 2016 @ 9:38pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 1 Dec, 2016 @ 9:15pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 15 Dec, 2016 @ 8:43pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 15 Dec, 2016 @ 2:22am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 26 Nov, 2016 @ 11:54pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 10 Dec, 2018 @ 7:46pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 10 Mar, 2017 @ 7:10pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 22 Mar, 2017 @ 11:30pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 27 Nov, 2016 @ 2:50am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 22 Mar, 2017 @ 1:51am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 27 Nov, 2016 @ 2:52am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 22 Mar, 2017 @ 1:24am

Quantum Capacitance

Overcharge it anyway.
Unlocked 1 Dec, 2016 @ 10:22pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 21 Mar, 2017 @ 2:17am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 15 Dec, 2016 @ 9:02pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 22 Mar, 2017 @ 1:33am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 22 Mar, 2017 @ 1:44am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 3 Dec, 2016 @ 1:11am

Contest Propellant

Find the snack supply canister.
Unlocked 28 Apr, 2021 @ 3:25am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 11 Mar, 2020 @ 10:27pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 11 Mar, 2020 @ 10:28pm

Well-Done

Cook a Grenade for too long.
Unlocked 11 Mar, 2020 @ 10:31pm



Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

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​​.

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.

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.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

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