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22 of 50 (44%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 30 Nov, 2019 @ 6:35am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 6 Dec, 2019 @ 7:39am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 8 Apr, 2020 @ 8:53am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 22 Mar, 2020 @ 4:04am

Convection Refinement

Ruin the microwave casserole.
Unlocked 30 Nov, 2019 @ 6:33am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 21 Mar, 2020 @ 2:36am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 5 Jan, 2021 @ 10:03am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 14 Apr, 2020 @ 9:31am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 2 Aug, 2020 @ 4:33am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 15 Dec, 2019 @ 6:46am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 23 Dec, 2019 @ 8:23am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 14 Dec, 2019 @ 7:48am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 20 Mar, 2020 @ 10:19am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 16 Apr, 2020 @ 3:24am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 4 Dec, 2019 @ 9:35am

Quantum Capacitance

Overcharge it anyway.
Unlocked 14 Dec, 2019 @ 8:16am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 29 Mar, 2020 @ 1:54pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 18 Jul, 2020 @ 8:16am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 25 Mar, 2020 @ 2:07pm

Contest Propellant

Find the snack supply canister.
Unlocked 20 Jul, 2020 @ 6:23am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 15 Apr, 2020 @ 11:41am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 16 Apr, 2020 @ 3:55am



Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

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.

PhD in Pacifism

Don't kill any Vortigaunts 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.

Well-Done

Cook a Grenade for too long.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked