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23 of 50 (46%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 20 Jun, 2020 @ 1:39am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 20 Jun, 2020 @ 7:19am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 21 Jun, 2020 @ 6:15am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 21 Jun, 2020 @ 4:57am

Convection Refinement

Ruin the microwave casserole.
Unlocked 20 Jun, 2020 @ 1:37am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 20 Jun, 2020 @ 3:02am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 20 Jun, 2020 @ 4:41am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 21 Jun, 2020 @ 4:52am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 20 Jun, 2020 @ 2:06am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Jun, 2020 @ 6:20am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 21 Jun, 2020 @ 5:17am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 21 Jun, 2020 @ 8:25am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 20 Jun, 2020 @ 1:30am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 20 Jun, 2020 @ 4:09am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 20 Jun, 2020 @ 1:50am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 21 Jun, 2020 @ 8:19am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 20 Jun, 2020 @ 6:59am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 22 Jun, 2020 @ 6:40am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 20 Jun, 2020 @ 7:16am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 23 Jun @ 10:54am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 21 Jun, 2020 @ 8:47am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 22 Jun, 2020 @ 7:17am

Well-Done

Cook a Grenade for too long.
Unlocked 21 Feb, 2021 @ 8:49am



Dead Reckoning

Kill an Assassin with the .357 Magnum.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Permeable Infrastructure

Use the alternate path in Office Complex.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

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.

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.​

Rather an Anticlimax

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

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked