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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Aug 4, 2019 @ 11:48pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Oct 23, 2019 @ 8:14am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Oct 23, 2019 @ 8:49am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Oct 24, 2019 @ 10:50am

Convection Refinement

Ruin the microwave casserole.
Unlocked Aug 4, 2019 @ 11:46pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Oct 24, 2019 @ 10:10am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Jun 4, 2020 @ 12:44pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Oct 21, 2019 @ 12:51pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Jun 5, 2020 @ 2:10pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Oct 23, 2019 @ 8:23am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Sep 20, 2019 @ 6:15am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jun 6, 2020 @ 4:44am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Sep 20, 2019 @ 6:31am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked May 11 @ 7:06am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Jun 5, 2020 @ 6:29am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Jun 6, 2020 @ 4:38am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Jun 5, 2020 @ 2:44pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Jun 6, 2020 @ 5:02am

Well-Done

Cook a Grenade for too long.
Unlocked May 27, 2020 @ 9:37am



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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Universal Gravitation

Get killed by your own Snarks.

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.​

Rather an Anticlimax

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

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked