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27 of 50 (54%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 2 Jun, 2020 @ 10:07am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 10 Jun, 2020 @ 10:49am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 12 Dec, 2021 @ 5:50pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 4 Oct, 2021 @ 10:54am

Convection Refinement

Ruin the microwave casserole.
Unlocked 2 Jun, 2020 @ 10:05am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 29 Jul, 2021 @ 4:58pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 23 Jun, 2022 @ 4:10pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 18 Oct, 2024 @ 9:45pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 19 May, 2023 @ 1:55am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 1 Aug, 2021 @ 9:16am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 10 Jun, 2020 @ 4:23am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 29 Mar, 2024 @ 6:13pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 12 May, 2023 @ 2:25pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 1 Aug, 2021 @ 8:32am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 23 Jun, 2022 @ 12:47am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 2 Jun, 2020 @ 3:44pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 31 Jul, 2021 @ 10:12am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 2 Aug, 2020 @ 2:40pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 2 Jan, 2022 @ 6:46pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 13 Dec, 2021 @ 6:53pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 17 May, 2024 @ 11:13am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 10 Jun, 2020 @ 5:44am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 2 Aug, 2020 @ 3:23pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 24 Nov, 2024 @ 2:12pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 21 Dec, 2024 @ 11:21pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 1 May, 2024 @ 5:29am

Well-Done

Cook a Grenade for too long.
Unlocked 10 Jun, 2020 @ 7:31am



Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Premature Expulsion

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

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

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.

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.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked