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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 11 Mar, 2020 @ 1:25am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 11 Mar, 2020 @ 4:14am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 8 Apr, 2020 @ 7:54am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 15 Apr, 2020 @ 6:08am

Convection Refinement

Ruin the microwave casserole.
Unlocked 11 Mar, 2020 @ 1:22am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 15 Apr, 2020 @ 6:42am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 14 Apr, 2020 @ 12:46pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 15 Apr, 2020 @ 6:56am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 1 Jan, 2021 @ 5:05am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 14 Apr, 2020 @ 2:28pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 15 Apr, 2020 @ 9:03am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 15 Apr, 2020 @ 7:25am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 11 Mar, 2020 @ 2:48am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 11 Mar, 2020 @ 1:11am

Quantum Capacitance

Overcharge it anyway.
Unlocked 1 Jan, 2021 @ 4:56am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 8 Apr, 2020 @ 9:21am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 11 Mar, 2020 @ 2:14am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 14 Apr, 2020 @ 12:24pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 21 Mar, 2021 @ 8:57am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 15 Apr, 2020 @ 9:24am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 14 Apr, 2020 @ 3:07pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 1 Jan, 2021 @ 4:53am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 21 Mar, 2021 @ 5:54am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 1 Jan, 2021 @ 6:52am

Contest Propellant

Find the snack supply canister.
Unlocked 21 Mar, 2021 @ 6:29am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 21 Mar, 2021 @ 8:57am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 21 Mar, 2021 @ 6:52am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 21 Mar, 2021 @ 6:27am

Well-Done

Cook a Grenade for too long.
Unlocked 12 Mar, 2020 @ 8:00am



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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Permeable Infrastructure

Use the alternate path in Office Complex.

Rare Specimen

Send the Hidden Hat to Xen.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans 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.

Post-Mortem Interval

Find each member of the missing research teams.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked