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27 of 50 (54%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 9 Nov, 2020 @ 8:40am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 21 Jan, 2020 @ 2:26am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 21 Jan, 2020 @ 4:37am

Convection Refinement

Ruin the microwave casserole.
Unlocked 20 Jan, 2020 @ 2:42pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 21 Jan, 2020 @ 2:47am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 20 Jan, 2020 @ 11:50pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 15 Jun, 2020 @ 4:03am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 21 Jan, 2020 @ 12:42am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 21 Jan, 2020 @ 1:49am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 13 Dec, 2020 @ 9:42am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 14 Nov, 2020 @ 11:42am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 21 Jan, 2020 @ 9:18am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 23 Jan, 2020 @ 12:57pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 21 Jan, 2020 @ 1:03am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 14 May, 2023 @ 9:42am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 9 Nov, 2020 @ 8:54am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 30 Oct, 2020 @ 11:42am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 24 Nov, 2020 @ 7:46am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 15 Jun, 2020 @ 6:50am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 5 Dec, 2020 @ 11:22pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 15 Jun, 2020 @ 4:59am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 15 Dec, 2020 @ 8:38am

Contest Propellant

Find the snack supply canister.
Unlocked 1 Nov, 2020 @ 6:34am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 18 Dec, 2020 @ 9:18pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 15 Jun, 2020 @ 7:23am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 15 Jun, 2020 @ 7:23am

Well-Done

Cook a Grenade for too long.
Unlocked 14 Nov, 2020 @ 1:19pm



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

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.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

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.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked