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40 of 50 (80%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 28 Jun, 2017 @ 5:22pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 30 Sep, 2017 @ 12:47pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 8 Oct, 2017 @ 11:32am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 13 Jul, 2017 @ 9:29am

Convection Refinement

Ruin the microwave casserole.
Unlocked 13 Jul, 2017 @ 11:51am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 13 Jul, 2017 @ 10:23am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 28 Jun, 2017 @ 9:20pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 3 Jul, 2017 @ 8:16pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 28 Jun, 2017 @ 9:29pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 13 Jul, 2017 @ 10:33am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 23 Sep, 2017 @ 3:11pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 30 Sep, 2017 @ 1:13pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 9 Oct, 2017 @ 9:33am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 9 Oct, 2017 @ 5:23pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 28 Jun, 2017 @ 8:35pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 14 Oct, 2017 @ 11:35am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 13 Jul, 2017 @ 9:44am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 8 Oct, 2017 @ 10:51am

Quantum Capacitance

Overcharge it anyway.
Unlocked 3 Jul, 2017 @ 8:19pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 6 Jul, 2021 @ 5:12pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 9 Oct, 2017 @ 5:22pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 8 Oct, 2017 @ 11:14am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 13 Jul, 2017 @ 9:24am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 16 Apr, 2022 @ 9:54pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 17 Apr, 2022 @ 10:12pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 17 Apr, 2022 @ 7:42pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 17 Apr, 2022 @ 7:19pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 17 Apr, 2022 @ 6:50pm

Following the Rules

Use the welcome mat.
Unlocked 17 Apr, 2022 @ 10:32pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 16 Apr, 2022 @ 1:28am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 17 Apr, 2022 @ 7:11pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 17 Apr, 2022 @ 11:52pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 17 Apr, 2022 @ 11:53pm

Contest Propellant

Find the snack supply canister.
Unlocked 17 Apr, 2022 @ 7:08pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 16 Apr, 2022 @ 1:38am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 17 Apr, 2022 @ 10:23pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 17 Apr, 2022 @ 10:24pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 16 Apr, 2022 @ 10:27pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 16 Apr, 2022 @ 10:26pm

Well-Done

Cook a Grenade for too long.
Unlocked 16 Apr, 2022 @ 1:01am



Futile Resistance

Kill 10 Enemies with Snarks.

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​​.

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.
+3

3 hidden achievements remaining

Details for each achievement will be revealed once unlocked