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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 5 May, 2015 @ 10:07am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 5 May, 2015 @ 10:27am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 7 May, 2015 @ 12:28pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 12 May, 2015 @ 12:47pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 5 May, 2015 @ 10:07am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 10 May, 2015 @ 12:06pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 12 May, 2015 @ 1:17pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 18 Jan, 2020 @ 11:20am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 19 Jan, 2020 @ 8:19am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 6 May, 2015 @ 11:03am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 13 May, 2015 @ 10:22am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 17 Jan, 2020 @ 12:38pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 6 May, 2015 @ 11:00am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 12 May, 2015 @ 12:48pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 12 May, 2015 @ 11:30am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 6 May, 2015 @ 10:24am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 13 May, 2015 @ 10:18am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 1 Jan, 2016 @ 10:49am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 20 May, 2015 @ 2:01pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 11 May, 2015 @ 11:48am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 20 Jan, 2020 @ 11:03am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 13 May, 2015 @ 10:30am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 6 Jun, 2015 @ 6:28am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 18 Jan, 2020 @ 4:18am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 12 May, 2015 @ 11:33am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 6 May, 2021 @ 9:40am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 8 May, 2021 @ 5:21am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 23 Mar, 2021 @ 2:02pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 22 Mar, 2021 @ 12:47pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 21 Mar, 2020 @ 5:22am

Well-Done

Cook a Grenade for too long.
Unlocked 23 Mar, 2021 @ 1:26pm



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked