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25 of 50 (50%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 2 Jan, 2023 @ 8:28pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 19 May, 2022 @ 4:18pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 2 Jan, 2023 @ 8:26pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 23 Jun, 2023 @ 1:06pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 9 Nov, 2021 @ 11:59am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 20 Mar, 2023 @ 8:05am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 9 Nov, 2021 @ 12:32pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 2 Jan, 2023 @ 8:52pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 27 May, 2022 @ 4:43pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 9 Nov, 2021 @ 2:14pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 14 Mar, 2023 @ 2:30pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 31 May, 2022 @ 4:41pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 25 May, 2023 @ 2:56pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 20 Aug, 2024 @ 11:29am

Quantum Capacitance

Overcharge it anyway.
Unlocked 9 Nov, 2021 @ 11:42am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 17 Mar, 2024 @ 7:47pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 18 Aug, 2024 @ 1:11pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 27 May, 2022 @ 4:20pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 12 Jul, 2023 @ 2:40pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 19 Mar, 2023 @ 5:36pm

Following the Rules

Use the welcome mat.
Unlocked 9 Nov, 2021 @ 1:22pm

Contest Propellant

Find the snack supply canister.
Unlocked 7 Apr, 2024 @ 4:38pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 9 Nov, 2021 @ 4:16pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 21 Nov, 2021 @ 5:15pm

Well-Done

Cook a Grenade for too long.
Unlocked 8 Nov, 2021 @ 12:30pm



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Ethically Questionable

Conduct all of the questionable research experiments.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own 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.

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.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

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.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked