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28 of 50 (56%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 9 Nov, 2018 @ 4:18am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 10 Nov, 2018 @ 2:30am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 18 May, 2022 @ 9:13pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 9 Nov, 2018 @ 4:16am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 18 Sep, 2024 @ 9:55am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 23 May, 2022 @ 8:44am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 17 May, 2022 @ 10:17pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 13 Jun, 2022 @ 7:06am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 6 Jun, 2020 @ 6:28am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 21 Sep, 2022 @ 7:40pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 18 May, 2022 @ 2:04pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 2 Jun, 2022 @ 12:17pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 10 Nov, 2018 @ 2:23am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 18 May, 2022 @ 7:16pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 17 May, 2022 @ 3:14pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 1 Jun, 2020 @ 12:37am

Quantum Capacitance

Overcharge it anyway.
Unlocked 18 Nov, 2018 @ 4:30am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 4 Jun, 2022 @ 7:54am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 3 Jun, 2022 @ 1:02pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 18 May, 2022 @ 6:15pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 2 Jun, 2022 @ 12:37pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 17 May, 2022 @ 9:09pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 17 May, 2022 @ 2:41pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 3 Jun, 2022 @ 1:00pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 2 Jun, 2022 @ 11:47am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 18 May, 2022 @ 8:13pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 18 May, 2022 @ 10:50pm

Well-Done

Cook a Grenade for too long.
Unlocked 3 Jun, 2022 @ 1:22pm



Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Dead Reckoning

Kill an Assassin with the .357 Magnum.

Ethically Questionable

Conduct all of the questionable research experiments.

Rare Specimen

Send the Hidden Hat to Xen.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.

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.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked