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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 11 Apr, 2020 @ 10:38am

Convection Refinement

Ruin the microwave casserole.
Unlocked 13 Dec @ 11:58am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 19 Dec @ 4:53am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 5 Jan, 2022 @ 1:55am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 23 Apr, 2020 @ 12:55pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 13 Dec @ 9:42pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 23 Apr, 2020 @ 2:10pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 11 Apr, 2020 @ 11:20am

Quantum Capacitance

Overcharge it anyway.
Unlocked 11 Jan, 2022 @ 4:26am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 14 Jan, 2022 @ 5:51am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 11 Apr, 2020 @ 10:48am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 23 Apr, 2020 @ 11:58am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 23 Apr, 2020 @ 2:42pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 23 Apr, 2020 @ 2:41pm

Well-Done

Cook a Grenade for too long.
Unlocked 5 Jan, 2022 @ 1:23am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Inflammatory Actions

Kill a Headcrab using fire.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Resonance Procrastinator

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

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Our Brains And Your Brawn

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

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.

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.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked