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38 of 50 (76%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 24 Nov, 2020 @ 9:08am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 25 Jan, 2022 @ 12:33pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 25 Jan, 2022 @ 12:58pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 26 Nov, 2020 @ 5:57am

Convection Refinement

Ruin the microwave casserole.
Unlocked 24 Nov, 2020 @ 9:07am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 26 Jan, 2022 @ 10:58am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 25 Jan, 2022 @ 1:19pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 26 Nov, 2020 @ 2:39am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 26 Nov, 2020 @ 1:18am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 26 Nov, 2020 @ 5:35am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 26 Nov, 2020 @ 2:34am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 27 Jan, 2022 @ 5:50am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 26 Mar, 2021 @ 4:24am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 24 Nov, 2020 @ 10:38am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 26 Nov, 2020 @ 5:33am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 7 Jul, 2022 @ 8:04am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 26 Mar, 2021 @ 3:44am

Quantum Capacitance

Overcharge it anyway.
Unlocked 26 Nov, 2020 @ 2:37am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 24 Nov, 2020 @ 11:56am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 26 Mar, 2021 @ 3:59am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 29 Jan, 2022 @ 5:21am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 27 Jan, 2022 @ 6:30am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 25 Mar, 2021 @ 4:41am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 26 Mar, 2021 @ 3:42am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 25 Jan, 2022 @ 1:07pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 26 Mar, 2021 @ 4:11am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 26 Mar, 2021 @ 4:18am

Following the Rules

Use the welcome mat.
Unlocked 26 Mar, 2021 @ 4:25am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 29 Jan, 2022 @ 6:09am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 24 Mar, 2021 @ 6:26am

Contest Propellant

Find the snack supply canister.
Unlocked 24 Mar, 2021 @ 7:34am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 7 Jul, 2022 @ 10:17am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 24 Mar, 2021 @ 7:33am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 23 Jun, 2022 @ 9:58am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 29 Jan, 2022 @ 11:21am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 25 Mar, 2021 @ 5:48am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 25 Mar, 2021 @ 5:53am

Well-Done

Cook a Grenade for too long.
Unlocked 26 Nov, 2020 @ 1:17am



Futile Resistance

Kill 10 Enemies with Snarks.

Mega Hertz

Kill 5 Enemies with one Grenade.

Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Post-Mortem Interval

Find each member of the missing research teams.

Laser Immunization

Complete Interloper without taking any laser damage.
+5

5 hidden achievements remaining

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