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29 of 50 (58%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 22 Dec, 2015 @ 3:58pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 23 Dec, 2015 @ 8:35am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 23 Dec, 2015 @ 5:56am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 26 Dec, 2015 @ 3:59pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 22 Dec, 2015 @ 3:57pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 23 Dec, 2015 @ 9:12am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 11 Jan, 2023 @ 12:20pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 23 Dec, 2015 @ 1:50pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 22 Dec, 2015 @ 5:11pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 10 Jan, 2023 @ 11:50am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 14 Jan, 2023 @ 3:04pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 26 Jan, 2021 @ 1:39pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 26 Jan, 2021 @ 12:44pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 25 Jan, 2021 @ 8:04am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 22 Dec, 2015 @ 5:04pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 22 Dec, 2015 @ 3:52pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 26 Dec, 2015 @ 4:17pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 23 Dec, 2015 @ 6:04am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 10 Jan, 2023 @ 11:42am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 14 Jan, 2023 @ 3:18pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 18 Jan, 2019 @ 6:55pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 2 Feb, 2023 @ 1:52am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 11 Jan, 2023 @ 12:13pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 10 Jan, 2023 @ 11:38am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 26 Jan, 2021 @ 2:14pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 26 Jan, 2021 @ 2:09pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 26 Jan, 2021 @ 4:29pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 26 Jan, 2021 @ 4:28pm

Well-Done

Cook a Grenade for too long.
Unlocked 25 Jan, 2021 @ 6:11am



Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.

Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

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.

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.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked