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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 4 Jan, 2022 @ 8:22am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 4 Jan, 2022 @ 9:12am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 4 Jan, 2022 @ 9:24am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 5 Jan, 2022 @ 7:12am

Convection Refinement

Ruin the microwave casserole.
Unlocked 4 Jan, 2022 @ 8:20am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 4 Jan, 2022 @ 11:07am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 6 Jan, 2022 @ 11:40am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 4 Jan, 2022 @ 10:26am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 7 Jan, 2022 @ 9:45am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 5 Jan, 2022 @ 8:56am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 4 Jan, 2022 @ 9:40am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 7 Jan, 2022 @ 9:35am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 4 Jan, 2022 @ 9:17am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 5 Jan, 2022 @ 6:52am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 6 Jan, 2022 @ 11:40am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 4 Jan, 2022 @ 8:16am

Quantum Capacitance

Overcharge it anyway.
Unlocked 7 Jan, 2022 @ 9:26am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 4 Jan, 2022 @ 9:55am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 6 Jan, 2022 @ 12:01pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 6 Jan, 2022 @ 12:45pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 6 Jan, 2022 @ 11:42am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 5 Jan, 2022 @ 10:46am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 5 Jan, 2022 @ 6:21am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 7 Jan, 2022 @ 10:05am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 6 Jan, 2022 @ 11:59am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 7 Jan, 2022 @ 9:26am

Following the Rules

Use the welcome mat.
Unlocked 5 Jan, 2022 @ 7:53am

Contest Propellant

Find the snack supply canister.
Unlocked 5 Jan, 2022 @ 9:29am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 5 Jan, 2022 @ 9:27am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 5 Jan, 2022 @ 11:07am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 5 Jan, 2022 @ 11:06am



Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

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.​

Well-Done

Cook a Grenade for too long.
+4

4 hidden achievements remaining

Details for each achievement will be revealed once unlocked