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30 of 50 (60%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 15 May, 2015 @ 11:15am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 16 May, 2015 @ 5:41am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 17 Jan, 2019 @ 3:28pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 3 Oct, 2015 @ 9:25am

Convection Refinement

Ruin the microwave casserole.
Unlocked 15 May, 2015 @ 11:14am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 5 Dec, 2016 @ 8:33am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 3 Oct, 2015 @ 9:06am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 17 Jan, 2019 @ 11:34am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 17 Jan, 2019 @ 4:04pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 16 May, 2015 @ 12:51pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 17 Jan, 2019 @ 4:27pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 15 May, 2015 @ 2:36pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 21 Jan, 2019 @ 2:14pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 21 Jan, 2019 @ 2:26pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Jan, 2019 @ 1:43pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 16 May, 2015 @ 3:35am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 7 Oct, 2015 @ 10:47am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 28 Jan, 2016 @ 8:47am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 15 May, 2015 @ 11:12am

Quantum Capacitance

Overcharge it anyway.
Unlocked 3 Sep, 2015 @ 10:12am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 21 Jan, 2019 @ 1:11pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 21 Jan, 2019 @ 1:55pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 15 May, 2015 @ 11:39am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 17 Jan, 2019 @ 7:26am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 17 Jan, 2019 @ 12:04pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 29 Apr, 2020 @ 11:04am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 8 Mar, 2021 @ 7:22pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 26 Mar, 2020 @ 4:00pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 26 Mar, 2020 @ 4:04pm

Well-Done

Cook a Grenade for too long.
Unlocked 29 Apr, 2020 @ 10:57am



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

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.

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.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked