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23 of 50 (46%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 31 Dec, 2023 @ 2:07am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 20 Aug, 2024 @ 5:04am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 5 Jan, 2024 @ 1:24am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 1 Jan, 2024 @ 4:45am

Convection Refinement

Ruin the microwave casserole.
Unlocked 31 Dec, 2023 @ 2:04am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 1 Jan, 2024 @ 5:02am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 31 Dec, 2023 @ 7:51am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 31 Dec, 2023 @ 2:40am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 5 Jan, 2024 @ 1:46am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 1 Mar, 2024 @ 6:52pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 1 Mar, 2024 @ 6:47pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 31 Dec, 2023 @ 2:28am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 20 Aug, 2024 @ 4:13am

Quantum Capacitance

Overcharge it anyway.
Unlocked 1 Jan, 2024 @ 4:55am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 5 Jan, 2024 @ 1:03am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 20 Aug, 2024 @ 4:49am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 1 Mar, 2024 @ 8:34pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 6 Jan, 2024 @ 11:50pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 20 Aug, 2024 @ 4:49am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 7 Jan, 2024 @ 12:07am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 1 Mar, 2024 @ 9:00pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 1 Mar, 2024 @ 9:05pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 20 Aug, 2024 @ 3:58am



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Permeable Infrastructure

Use the alternate path in Office Complex.

Rare Specimen

Send the Hidden Hat to Xen.

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.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

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.

Late for Work

Defeat Nihilanth in under 4 minutes.​

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked