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29 of 50 (58%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 8 Nov, 2023 @ 11:30am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 17 Aug, 2023 @ 11:34pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 18 Nov, 2023 @ 6:12pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 22 Aug, 2023 @ 5:49pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 17 Aug, 2023 @ 9:42pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 18 Aug, 2023 @ 2:52pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 24 Nov, 2023 @ 11:47am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 22 Aug, 2023 @ 5:41pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 8 Nov, 2023 @ 6:54am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 11 Jan, 2024 @ 5:52pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 30 Dec, 2023 @ 3:01pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 8 Nov, 2023 @ 6:47am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 30 Dec, 2023 @ 4:55pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 14 Nov, 2023 @ 11:19am

Quantum Capacitance

Overcharge it anyway.
Unlocked 24 Nov, 2023 @ 11:43am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 30 Dec, 2023 @ 5:22pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 8 Nov, 2023 @ 11:41am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 18 Nov, 2023 @ 6:04pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 11 Jan, 2024 @ 4:17pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 7 Feb, 2024 @ 12:46pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 19 Jun, 2024 @ 7:56pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 18 Apr, 2024 @ 8:52pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 11 Jan, 2024 @ 6:34pm

Contest Propellant

Find the snack supply canister.
Unlocked 8 Nov, 2023 @ 8:00am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 7 Feb, 2024 @ 3:20pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 8 Nov, 2023 @ 7:58am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 8 Nov, 2023 @ 11:16am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 8 Nov, 2023 @ 11:16am

Well-Done

Cook a Grenade for too long.
Unlocked 18 Nov, 2023 @ 6:12pm



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

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.

Mega Hertz

Kill 5 Enemies with one Grenade.

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.

Post-Mortem Interval

Find each member of the missing research teams.

Laser Immunization

Complete Interloper without taking any laser damage.

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.

Rather an Anticlimax

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

6 hidden achievements remaining

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