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25 of 50 (50%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 11 Aug, 2020 @ 6:18am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 23 Jul, 2021 @ 12:09pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 14 Apr, 2020 @ 10:31am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 12 Aug, 2020 @ 2:13pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 14 Feb @ 6:29am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 11 Aug, 2020 @ 2:01pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 13 Aug, 2020 @ 5:35am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 13 Dec, 2022 @ 8:49am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 7 Dec, 2020 @ 6:07am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 4 Dec, 2020 @ 1:55pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 13 Aug, 2020 @ 11:27am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 11 Aug, 2020 @ 2:29pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 14 Apr, 2020 @ 1:35pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 24 Nov @ 5:10am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 7 Dec, 2020 @ 6:00am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 13 Aug, 2020 @ 11:20am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 26 Jul, 2021 @ 3:58am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 11 Aug, 2020 @ 7:14am

Following the Rules

Use the welcome mat.
Unlocked 15 Dec, 2022 @ 12:33pm

Contest Propellant

Find the snack supply canister.
Unlocked 16 Dec, 2022 @ 9:10am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 16 Apr, 2020 @ 1:48pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 16 Apr, 2020 @ 1:44pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 7 Dec, 2020 @ 7:31am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 13 Aug, 2020 @ 11:46am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 13 Aug, 2020 @ 11:45am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

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.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.

Well-Done

Cook a Grenade for too long.
+5

5 hidden achievements remaining

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