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20 of 50 (40%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 28 Nov, 2017 @ 7:20am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 28 Nov, 2017 @ 12:12pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 28 Aug, 2022 @ 5:48pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 28 Nov, 2017 @ 7:16am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 28 Aug, 2022 @ 11:54am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 26 Aug, 2022 @ 8:16pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 2 Sep, 2022 @ 5:54pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 27 Aug, 2022 @ 11:34am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 2 Sep, 2022 @ 4:01pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 28 Aug, 2022 @ 11:00am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 28 Nov, 2017 @ 12:39pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 21 Mar, 2020 @ 8:06am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 28 Nov, 2017 @ 6:58am

Quantum Capacitance

Overcharge it anyway.
Unlocked 28 Aug, 2022 @ 11:00am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 28 Aug, 2022 @ 5:13pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 27 Aug, 2022 @ 11:19pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 21 Aug, 2022 @ 8:21am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 3 Sep, 2022 @ 7:50am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 3 Sep, 2022 @ 10:00am

Well-Done

Cook a Grenade for too long.
Unlocked 28 Mar, 2020 @ 7:53am



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.

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.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Universal Gravitation

Get killed by your own Snarks.

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.​

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.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked