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39 of 50 (78%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 12 Sep, 2021 @ 10:30am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 14 Sep, 2022 @ 3:27pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 24 Sep, 2022 @ 9:06am

Convection Refinement

Ruin the microwave casserole.
Unlocked 12 Sep, 2021 @ 10:27am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 25 Nov, 2022 @ 10:21am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 23 Sep, 2023 @ 1:00pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 16 Oct, 2022 @ 5:20am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 24 Nov, 2022 @ 11:20am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 21 Oct, 2022 @ 8:44pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 16 Oct, 2022 @ 5:20am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 12 Sep, 2021 @ 10:57am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 24 Nov, 2022 @ 11:20am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 13 Jun, 2023 @ 10:12pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 13 Jun, 2023 @ 11:50am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 14 Jun, 2023 @ 2:05am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 16 Oct, 2022 @ 5:20am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 12 Sep, 2021 @ 10:34am

Quantum Capacitance

Overcharge it anyway.
Unlocked 23 Sep, 2022 @ 4:34pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 24 Nov, 2022 @ 7:21pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 12 Sep, 2021 @ 10:46am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 3 Sep, 2023 @ 6:15pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 16 Oct, 2022 @ 5:20am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 16 Oct, 2022 @ 5:20am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 25 Nov, 2022 @ 6:04am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 16 Oct, 2022 @ 5:20am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 16 Oct, 2022 @ 5:20am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 16 Oct, 2022 @ 5:20am

Following the Rules

Use the welcome mat.
Unlocked 16 Oct, 2022 @ 5:20am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 16 Oct, 2022 @ 5:20am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 16 Oct, 2022 @ 5:20am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 16 Oct, 2022 @ 5:20am

Contest Propellant

Find the snack supply canister.
Unlocked 14 Jun, 2023 @ 12:17am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 16 Oct, 2022 @ 5:20am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 15 Oct, 2022 @ 8:59pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 16 Oct, 2022 @ 5:20am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 14 Jun, 2023 @ 2:42am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 16 Oct, 2022 @ 3:41am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 16 Oct, 2022 @ 3:40am

Well-Done

Cook a Grenade for too long.
Unlocked 24 Sep, 2022 @ 10:53am



Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Rare Specimen

Send the Hidden Hat to Xen.

Universal Gravitation

Get killed by your own Snarks.

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.
+2

2 hidden achievements remaining

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