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30 of 50 (60%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 8 Mar, 2020 @ 3:08am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 9 Mar, 2020 @ 8:25am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 1 Apr, 2020 @ 6:21am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 25 Jul, 2022 @ 2:24pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 8 Mar, 2020 @ 3:05am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 1 Apr, 2020 @ 4:28am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 29 May, 2022 @ 8:12am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 30 May, 2022 @ 11:13am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 9 Mar, 2020 @ 8:39am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 27 Jul, 2022 @ 3:39am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 28 May, 2022 @ 5:23am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 29 May, 2022 @ 11:49am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 29 May, 2022 @ 10:04am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 30 May, 2022 @ 11:37am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 8 Mar, 2020 @ 4:41am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 2 Apr, 2020 @ 11:11am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 28 May, 2022 @ 5:06am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 8 Mar, 2020 @ 3:01am

Quantum Capacitance

Overcharge it anyway.
Unlocked 30 May, 2022 @ 11:04am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 1 Jan, 2023 @ 9:11am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 30 May, 2022 @ 1:36am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 28 May, 2022 @ 4:50am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 29 May, 2022 @ 11:56am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 30 May, 2022 @ 11:05am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 30 May, 2022 @ 2:17am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 26 Jul, 2022 @ 5:08am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 1 Jan, 2023 @ 9:20am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 29 May, 2022 @ 11:37am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 27 May, 2022 @ 2:00pm

Well-Done

Cook a Grenade for too long.
Unlocked 28 May, 2022 @ 5:14am



Ethically Questionable

Conduct all of the questionable research experiments.

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.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.
6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked