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31 of 50 (62%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 25 Jan @ 9:44am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 28 Jan @ 11:41am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 28 Jan @ 1:43pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 30 Jan @ 6:35am

Convection Refinement

Ruin the microwave casserole.
Unlocked 9 May, 2023 @ 5:47am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 29 Jan @ 3:06am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 28 Jan @ 1:37pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 28 Jan @ 3:41pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 30 Jan @ 6:25am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 28 Jan @ 12:02pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 28 Jan @ 1:47pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 28 Jan @ 2:01pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 29 Jan @ 7:25am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 28 Jan @ 1:14pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 30 Jan @ 5:29am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 28 Jan @ 12:04pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 28 Jan @ 11:38am

Quantum Capacitance

Overcharge it anyway.
Unlocked 29 Jan @ 6:34am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 30 Jan @ 6:54am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 28 Jan @ 2:34pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 28 Jan @ 11:51am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 28 Jan @ 2:45pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 29 Jan @ 6:24am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 29 Jan @ 3:05am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 30 Jan @ 1:48am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 30 Jan @ 6:54am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 28 Jan @ 1:25pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 28 Jan @ 11:48am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 30 Jan @ 7:01am

Following the Rules

Use the welcome mat.
Unlocked 30 Jan @ 7:17am

Well-Done

Cook a Grenade for too long.
Unlocked 28 Jan @ 1:26pm



Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked