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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 26 May, 2020 @ 8:19am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 26 May, 2020 @ 9:54am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 26 May, 2020 @ 6:48pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 28 May, 2020 @ 11:42am

Convection Refinement

Ruin the microwave casserole.
Unlocked 26 May, 2020 @ 8:17am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 28 May, 2020 @ 6:58pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 26 May, 2020 @ 10:20am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 27 May, 2020 @ 5:27pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 27 May, 2020 @ 5:18pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 10 Aug, 2021 @ 12:02pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 10 Aug, 2021 @ 1:47pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 29 May, 2020 @ 9:36am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 10 Aug, 2021 @ 12:21pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 28 May, 2020 @ 7:19pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 26 May, 2020 @ 9:07am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 17 Dec, 2020 @ 9:18am

Quantum Capacitance

Overcharge it anyway.
Unlocked 27 May, 2020 @ 5:42pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 28 May, 2020 @ 11:25am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 17 Dec, 2020 @ 9:50am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 10 Aug, 2021 @ 1:21pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 27 May, 2020 @ 5:23pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 29 May, 2020 @ 10:09pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 28 May, 2020 @ 7:30pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 26 May, 2020 @ 8:32am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 29 May, 2020 @ 9:02am

Contest Propellant

Find the snack supply canister.
Unlocked 29 May, 2020 @ 11:11am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 29 May, 2020 @ 11:07am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 29 May, 2020 @ 10:56pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 29 May, 2020 @ 10:54pm

Well-Done

Cook a Grenade for too long.
Unlocked 26 May, 2020 @ 10:10am



Ethically Questionable

Conduct all of the questionable research experiments.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

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.

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.

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.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked