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24 of 50 (48%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 6 Jul, 2022 @ 10:25am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 29 Nov, 2022 @ 11:31am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 8 Jul, 2022 @ 11:21pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 6 Jul, 2022 @ 10:24am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 10 Jul, 2022 @ 12:53pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 10 Jul, 2022 @ 1:12pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 10 Jul, 2022 @ 1:01pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 8 Jul, 2022 @ 11:07am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 29 Nov, 2022 @ 11:39am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 11 Jul, 2022 @ 2:13am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 11 Jul, 2022 @ 2:05am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 8 Jul, 2022 @ 11:20am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 11 Jul, 2022 @ 1:01pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 8 Jul, 2022 @ 12:06pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 11 Jul, 2022 @ 12:52pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 8 Jul, 2022 @ 10:51pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 29 Nov, 2022 @ 11:51am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 9 Jul, 2022 @ 12:45pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 8 Jul, 2022 @ 11:24pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 10 Jul, 2022 @ 12:28pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 11 Jul, 2022 @ 12:50pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 11 Jul, 2022 @ 4:12am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 11 Jul, 2022 @ 1:17pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 11 Jul, 2022 @ 1:16pm



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.

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.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked