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31 of 50 (62%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 25 Feb, 2017 @ 7:56am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 9 Mar, 2017 @ 7:22pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 14 Oct, 2017 @ 8:36pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 21 Oct, 2017 @ 10:47am

Convection Refinement

Ruin the microwave casserole.
Unlocked 25 Feb, 2017 @ 7:55am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 21 Oct, 2017 @ 12:40pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 21 Oct, 2017 @ 11:15am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 22 Oct, 2017 @ 1:24pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 14 Oct, 2017 @ 8:30pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 13 Oct, 2017 @ 6:15pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 22 Oct, 2017 @ 9:13am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 25 Feb, 2017 @ 8:18am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 22 Oct, 2017 @ 12:26pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 21 Oct, 2017 @ 11:33am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 22 Oct, 2017 @ 12:35pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 22 Oct, 2017 @ 11:36am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 22 Oct, 2017 @ 9:09am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 14 Oct, 2017 @ 8:31pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 22 Oct, 2017 @ 10:42am

Quantum Capacitance

Overcharge it anyway.
Unlocked 14 Oct, 2017 @ 8:49pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 25 Oct, 2017 @ 7:04pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 18 Mar, 2017 @ 8:45am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 22 Oct, 2017 @ 11:06am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 25 Feb, 2017 @ 8:40am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 14 Oct, 2017 @ 8:29pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 4 Aug, 2022 @ 5:56pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 4 Aug, 2022 @ 4:15pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 4 Aug, 2022 @ 3:35pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 4 Aug, 2022 @ 4:24pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 11 Aug, 2022 @ 11:35am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 4 Aug, 2022 @ 6:23pm



Prolific Popper

Kill all Protozoans 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.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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​.

Rather an Anticlimax

Decline G-Man’s offer of employment.

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

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