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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 24 Jul, 2016 @ 10:51am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 25 Jul, 2016 @ 12:13pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 28 Jul, 2016 @ 10:42pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 12 Aug, 2016 @ 1:37pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 24 Jul, 2016 @ 10:52am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 26 Dec, 2019 @ 2:20pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 25 Dec, 2019 @ 2:16am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 30 Dec, 2019 @ 3:20pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 31 Dec, 2019 @ 2:08pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 27 Jul, 2016 @ 5:10am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 12 Aug, 2016 @ 10:17am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 30 Dec, 2019 @ 3:12pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 31 Dec, 2019 @ 7:48am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 25 Dec, 2019 @ 1:45am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 31 Dec, 2019 @ 2:53am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 4 Jan, 2020 @ 12:41pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 12 Aug, 2016 @ 1:22pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 4 Jan, 2020 @ 12:44pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 4 Jan, 2020 @ 7:30am

Quantum Capacitance

Overcharge it anyway.
Unlocked 31 Dec, 2019 @ 2:51am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 1 Jan, 2020 @ 3:00am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 12 Aug, 2016 @ 1:40pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 4 Jan, 2020 @ 7:38am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 31 Dec, 2019 @ 1:14am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 7 Aug, 2016 @ 12:18am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 7 Oct, 2022 @ 2:19pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 8 Oct, 2022 @ 11:45am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 9 Apr, 2022 @ 5:46am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 8 Oct, 2022 @ 11:47am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 9 Apr, 2022 @ 5:28am

Well-Done

Cook a Grenade for too long.
Unlocked 30 Apr, 2022 @ 8:33am



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts 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.

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

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.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

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.​

Rather an Anticlimax

Decline G-Man’s offer of employment.
+6

6 hidden achievements remaining

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