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35 of 50 (70%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 29 Nov, 2015 @ 10:11am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 29 Nov, 2015 @ 11:49am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 5 Aug, 2017 @ 5:31pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 2 Feb, 2016 @ 11:22pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 29 Nov, 2015 @ 10:10am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 1 Aug, 2017 @ 7:57pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 5 Aug, 2017 @ 4:08pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 5 Aug, 2017 @ 5:26pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 5 Aug, 2017 @ 5:29pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 1 Dec, 2015 @ 8:33am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 5 Aug, 2017 @ 2:11am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 5 Aug, 2017 @ 3:48pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 5 Aug, 2017 @ 4:23pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 5 Aug, 2017 @ 4:23pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 5 Aug, 2017 @ 4:52pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 5 Aug, 2017 @ 3:55pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 5 Aug, 2017 @ 2:09am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 29 Nov, 2015 @ 11:00am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 5 Aug, 2017 @ 2:46pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 5 Aug, 2017 @ 4:39pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 31 Aug, 2017 @ 12:50am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 5 Aug, 2017 @ 6:24pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 5 Aug, 2017 @ 3:02pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 5 Aug, 2017 @ 3:21pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 5 Aug, 2017 @ 5:25pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 31 Jul, 2022 @ 4:11pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 24 Jun, 2023 @ 12:03pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 4 Jun, 2023 @ 10:04pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 2 Jun, 2023 @ 2:14pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 4 Jun, 2023 @ 8:04pm

Contest Propellant

Find the snack supply canister.
Unlocked 18 Jul, 2022 @ 10:12pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 18 Jul, 2022 @ 10:11pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 31 Jul, 2022 @ 4:49pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 31 Jul, 2022 @ 4:50pm

Well-Done

Cook a Grenade for too long.
Unlocked 23 Jun, 2023 @ 8:55am



Prolific Popper

Kill all Protozoans in the Borderworld.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

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