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28 of 50 (56%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 29 Oct, 2017 @ 7:46am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 4 Nov, 2017 @ 2:34am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 4 Nov, 2017 @ 2:34am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 4 Nov, 2017 @ 2:34am

Convection Refinement

Ruin the microwave casserole.
Unlocked 29 Oct, 2017 @ 7:45am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 4 Nov, 2017 @ 2:34am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 4 Nov, 2017 @ 2:34am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 4 Nov, 2017 @ 2:34am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 4 Nov, 2017 @ 2:34am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 29 Oct, 2017 @ 9:37am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 4 Nov, 2017 @ 2:34am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 4 Nov, 2017 @ 2:34am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 4 Nov, 2017 @ 2:34am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 4 Nov, 2017 @ 2:34am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 4 Nov, 2017 @ 2:34am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 29 Oct, 2017 @ 8:38am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 4 Nov, 2017 @ 2:34am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 4 Nov, 2017 @ 2:34am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 29 Oct, 2017 @ 7:42am

Quantum Capacitance

Overcharge it anyway.
Unlocked 4 Nov, 2017 @ 2:34am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 4 Nov, 2017 @ 2:34am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 4 Nov, 2017 @ 2:34am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 4 Nov, 2017 @ 2:34am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 4 Nov, 2017 @ 2:34am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 1 Nov, 2017 @ 7:58am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 2 Jul, 2020 @ 12:32am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 5 Jul, 2020 @ 5:42am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 5 Jul, 2020 @ 5:41am



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.

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.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked