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28 of 50 (56%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 5 May, 2015 @ 4:39pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 5 May, 2015 @ 5:47pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 20 May, 2020 @ 12:36pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 19 May, 2020 @ 5:32pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 5 May, 2015 @ 4:37pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 12 Sep, 2019 @ 2:26pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 17 Aug, 2022 @ 12:25pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 17 Aug, 2022 @ 9:59pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 3 Nov, 2015 @ 5:09pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 9 May, 2020 @ 9:08pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 16 Aug, 2022 @ 8:39pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 19 Mar, 2021 @ 10:12pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 16 May, 2020 @ 1:06pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 11 May, 2020 @ 6:59pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 21 May, 2020 @ 1:22am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 17 May, 2020 @ 7:40pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 13 Aug, 2017 @ 11:20pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 20 May, 2020 @ 12:37pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 23 May, 2020 @ 5:44pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 17 Aug, 2022 @ 10:01pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 11 May, 2020 @ 7:17pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 1 Dec, 2020 @ 7:59pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 22 May, 2020 @ 6:24pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 22 May, 2020 @ 6:17pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 23 May, 2020 @ 6:16pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 23 May, 2020 @ 6:16pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 21 Aug, 2022 @ 2:12pm

Well-Done

Cook a Grenade for too long.
Unlocked 15 Aug, 2022 @ 9:14pm



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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.

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.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked