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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 3 Jul, 2016 @ 2:48pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 21 May, 2018 @ 6:53pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 13 Dec, 2020 @ 4:10pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 15 Dec, 2020 @ 2:02pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 3 Jul, 2016 @ 2:47pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 22 May, 2018 @ 3:00pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 15 Dec, 2020 @ 2:54pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 10 Feb @ 7:45am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 3 Jul, 2016 @ 10:26pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 20 Feb, 2021 @ 11:49am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 13 Dec, 2020 @ 3:04pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 14 Dec, 2020 @ 4:23pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 27 Feb, 2020 @ 10:14pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 20 Feb, 2021 @ 12:38pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 3 Jul, 2016 @ 10:13pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 15 Dec, 2020 @ 3:02pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 3 Jul, 2016 @ 3:34pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 3 Jul, 2016 @ 2:45pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 14 Dec, 2020 @ 5:18pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 13 Dec, 2020 @ 4:04pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 3 Jul, 2016 @ 3:04pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 26 Aug, 2021 @ 12:42pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 15 Dec, 2020 @ 2:19pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 15 Dec, 2020 @ 2:25pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 11 Feb @ 3:16am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 26 Aug, 2021 @ 12:23pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 14 Feb @ 3:23pm

Well-Done

Cook a Grenade for too long.
Unlocked 14 Dec, 2020 @ 5:14pm



Ethically Questionable

Conduct all of the questionable research experiments.

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.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked