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19 of 50 (38%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 27 Dec, 2015 @ 1:05pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 3 Jan, 2016 @ 5:07am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 6 Jan, 2016 @ 5:36am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 21 Aug, 2018 @ 12:02pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 27 Dec, 2015 @ 1:04pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 3 Jan, 2016 @ 5:31am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 19 Mar, 2017 @ 9:03am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 7 Jan, 2016 @ 9:02am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 3 Jan, 2016 @ 4:55am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 14 Mar, 2020 @ 6:29pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 3 Jan, 2016 @ 6:08am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 27 Dec, 2015 @ 1:03pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 27 Dec, 2015 @ 1:24pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 19 Mar, 2017 @ 9:18am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 21 Aug, 2018 @ 12:20pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 15 Mar, 2020 @ 3:21pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 14 Mar, 2020 @ 5:21pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 15 Mar, 2020 @ 4:40pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 15 Mar, 2020 @ 4:48pm



Dead Reckoning

Kill an Assassin with the .357 Magnum.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Prolific Popper

Kill all Protozoans 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.

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.

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.​

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked