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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Dec 27, 2015 @ 4:49pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Dec 16, 2019 @ 5:31pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Jan 25, 2016 @ 12:40pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Dec 27, 2015 @ 4:48pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Dec 1, 2018 @ 4:11am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Dec 14, 2019 @ 4:20pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Jan 25, 2016 @ 1:00pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Dec 22, 2019 @ 3:32pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Aug 22, 2020 @ 12:19pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Mar 11, 2020 @ 8:17am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Dec 30, 2015 @ 5:21am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Dec 6, 2019 @ 4:40pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Dec 12, 2018 @ 2:14pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Aug 2, 2018 @ 4:20am

Quantum Capacitance

Overcharge it anyway.
Unlocked Dec 12, 2019 @ 11:25am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Mar 7, 2020 @ 6:35pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Mar 6, 2020 @ 6:18am

Universal Gravitation

Get killed by your own Snarks.
Unlocked Dec 12, 2019 @ 11:22am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Aug 31, 2020 @ 7:39am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Mar 12, 2020 @ 6:43am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Aug 14, 2020 @ 1:12pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Aug 10, 2020 @ 9:27am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Aug 31, 2020 @ 4:09pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked Feb 28, 2022 @ 8:41am

Contest Propellant

Find the snack supply canister.
Unlocked Aug 30, 2020 @ 6:23pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Mar 19, 2020 @ 3:13pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked Aug 31, 2020 @ 3:44pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Mar 20, 2020 @ 7:43am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Aug 31, 2020 @ 3:35pm

Well-Done

Cook a Grenade for too long.
Unlocked Mar 2, 2020 @ 9:29am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Rare Specimen

Send the Hidden Hat to Xen.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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​.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked