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42 of 50 (84%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Dec 29, 2017 @ 4:23pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Feb 7, 2020 @ 1:55pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Dec 28, 2021 @ 12:52am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked May 29, 2022 @ 4:38am

Convection Refinement

Ruin the microwave casserole.
Unlocked Dec 29, 2017 @ 4:22pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Dec 27, 2021 @ 6:01pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Jun 14, 2022 @ 12:00am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Jun 1, 2022 @ 6:16am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Dec 30, 2022 @ 10:29pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Dec 29, 2017 @ 5:48pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Jun 1, 2022 @ 5:39am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked May 29, 2022 @ 3:08am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Jun 1, 2022 @ 6:07am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked May 29, 2022 @ 3:36am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jun 1, 2022 @ 6:32am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Dec 26, 2021 @ 5:11pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Dec 28, 2021 @ 3:17am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked May 25, 2022 @ 11:13pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Jun 1, 2022 @ 5:19am

Quantum Capacitance

Overcharge it anyway.
Unlocked Feb 7, 2020 @ 8:44pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked May 26, 2022 @ 1:19am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Dec 28, 2021 @ 2:55am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Jun 1, 2022 @ 5:28am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked May 29, 2022 @ 3:11am

Universal Gravitation

Get killed by your own Snarks.
Unlocked Jun 1, 2022 @ 5:53am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Dec 18, 2022 @ 1:53am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked Jun 1, 2022 @ 5:14am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Dec 30, 2022 @ 10:54pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Jun 14, 2022 @ 12:11am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked Jun 1, 2022 @ 5:49am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Jun 1, 2022 @ 5:26am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Jun 1, 2022 @ 5:53am

Following the Rules

Use the welcome mat.
Unlocked Sep 12, 2022 @ 4:25pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Dec 18, 2022 @ 4:16am

Contest Propellant

Find the snack supply canister.
Unlocked Dec 18, 2022 @ 1:53am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Dec 28, 2021 @ 3:52am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked Jun 1, 2022 @ 5:11am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked Dec 18, 2022 @ 4:01am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Dec 28, 2021 @ 5:27am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Dec 28, 2021 @ 5:28am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked Dec 18, 2022 @ 4:03am

Well-Done

Cook a Grenade for too long.
Unlocked Aug 9, 2021 @ 1:51pm



Prolific Popper

Kill all Protozoans in the Borderworld.

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.

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.
+2

2 hidden achievements remaining

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