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36 of 50 (72%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 9 Jun, 2020 @ 8:33pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 9 Jun, 2020 @ 10:50pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 18 Jun, 2020 @ 6:40pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 15 Jun, 2020 @ 2:54pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 9 Jun, 2020 @ 8:32pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 15 Jun, 2020 @ 4:52pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 19 Jun, 2020 @ 12:13pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 19 Jun, 2020 @ 3:26pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 12 Jun, 2020 @ 12:08am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 21 Jul, 2020 @ 3:02pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 19 Jun, 2020 @ 12:09pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 12 Jul, 2020 @ 6:11pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 19 Jun, 2020 @ 1:09pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 18 Jun, 2020 @ 5:14pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 16 Jun, 2020 @ 4:16pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 12 Jul, 2020 @ 3:23pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 14 Jun, 2020 @ 9:00pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 17 Jul, 2020 @ 10:01am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 12 Jul, 2020 @ 4:06pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 18 Jun, 2020 @ 4:36pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 22 Jul, 2020 @ 3:08pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 12 Jun, 2020 @ 12:16am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 15 Jun, 2020 @ 3:38pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 18 Jun, 2020 @ 5:26pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 12 Jul, 2020 @ 4:03pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 16 Jun, 2020 @ 12:12am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 20 Jul, 2020 @ 5:49pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 21 Jul, 2020 @ 4:06pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 21 Jul, 2020 @ 4:07pm

Contest Propellant

Find the snack supply canister.
Unlocked 22 Jul, 2020 @ 3:07pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 22 Jul, 2020 @ 3:50pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 16 Jun, 2020 @ 5:01pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 23 Jul, 2020 @ 5:00pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 16 Jun, 2020 @ 8:23pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 16 Jun, 2020 @ 8:23pm

Well-Done

Cook a Grenade for too long.
Unlocked 9 Jun, 2020 @ 11:19pm



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Rare Specimen

Send the Hidden Hat to Xen.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

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.

Late for Work

Defeat Nihilanth in under 4 minutes.​
+4

4 hidden achievements remaining

Details for each achievement will be revealed once unlocked