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29 of 50 (58%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 31 Jan, 2020 @ 5:51am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 31 Jan, 2020 @ 5:58am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 6 Jan, 2020 @ 1:44pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 2 Feb, 2020 @ 8:50am

Convection Refinement

Ruin the microwave casserole.
Unlocked 2 Jan, 2020 @ 8:38am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 12 Jan, 2020 @ 10:53am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 20 Jan, 2020 @ 1:29pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 12 Jan, 2020 @ 12:11pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 22 Jan, 2020 @ 8:22am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 3 Jan, 2020 @ 4:28am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 22 Jan, 2020 @ 7:20am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 2 Jan, 2020 @ 9:08am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 6 Jan, 2020 @ 1:58pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 2 Feb, 2020 @ 9:22am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 24 Jan, 2020 @ 2:31am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 2 Feb, 2020 @ 8:33am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 28 Jan, 2020 @ 10:41am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 12 Jan, 2020 @ 11:50am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 31 Jan, 2020 @ 5:59am

Quantum Capacitance

Overcharge it anyway.
Unlocked 31 Jan, 2020 @ 6:04am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 20 Jan, 2020 @ 1:15pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 31 Jan, 2020 @ 6:15am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 22 Jan, 2020 @ 7:48am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 12 Jan, 2020 @ 11:49am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 8 Apr @ 12:42pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 8 Apr @ 1:08pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 25 Mar, 2020 @ 8:29am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 25 Mar, 2020 @ 8:28am

Well-Done

Cook a Grenade for too long.
Unlocked 15 Mar @ 9:45am



Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.

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.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked