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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 12 Jun, 2015 @ 1:34pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 11 Dec, 2019 @ 5:42pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 12 Dec, 2019 @ 6:33pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 14 Jun, 2015 @ 12:05pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 12 Jun, 2015 @ 1:32pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 13 Dec, 2019 @ 1:18pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 14 Dec, 2019 @ 6:49pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 13 Dec, 2019 @ 5:17pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 11 Dec, 2019 @ 6:14pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 14 Dec, 2019 @ 7:21pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 11 Dec, 2019 @ 3:23pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 19 Feb, 2017 @ 12:37pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 14 Jun, 2015 @ 5:40am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 12 Jun, 2015 @ 5:01pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 14 Dec, 2019 @ 7:13pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 11 Dec, 2019 @ 3:16pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 11 Dec, 2019 @ 2:52pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 13 Dec, 2019 @ 5:09pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 26 Jun, 2021 @ 5:35pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 12 Dec, 2019 @ 6:16pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 11 Dec, 2019 @ 3:09pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 26 Jun, 2021 @ 12:45pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 30 Jun, 2021 @ 7:17pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 26 Jun, 2021 @ 3:05pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 21 Jun, 2021 @ 5:58pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 29 Jun, 2021 @ 6:48pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 30 Jun, 2021 @ 7:19pm

Well-Done

Cook a Grenade for too long.
Unlocked 21 Jun, 2021 @ 6:22pm



Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

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​​.

Our Brains And Your Brawn

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

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.​

Rather an Anticlimax

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

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked