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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 20 Dec, 2019 @ 3:51pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 21 Dec, 2019 @ 11:46am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 14 Jan, 2020 @ 6:48pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 14 Jan, 2020 @ 6:35pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 14 Jan, 2020 @ 6:47pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 14 Jan, 2020 @ 6:38pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 16 Jan, 2020 @ 10:36am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 16 Jan, 2020 @ 6:54pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 16 Jan, 2020 @ 6:47pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 21 Dec, 2019 @ 1:58pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 14 Jan, 2020 @ 6:56pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 22 Dec, 2019 @ 8:58am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 16 Jan, 2020 @ 1:46pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 24 Dec, 2019 @ 7:28pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 16 Jan, 2020 @ 8:32pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 16 Jan, 2020 @ 10:18pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 27 Dec, 2019 @ 3:36pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 20 Dec, 2019 @ 4:37pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 20 Dec, 2019 @ 3:47pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 16 Jan, 2020 @ 6:53pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 16 Jan, 2020 @ 10:10pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 14 Jan, 2020 @ 6:58pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 16 Jan, 2020 @ 9:32am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 16 Jan, 2020 @ 10:40am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 4 Jan, 2020 @ 1:34am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 19 Mar, 2020 @ 1:47pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 31 Mar, 2020 @ 11:22pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 19 Mar, 2020 @ 2:01pm



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.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked