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35 of 50 (70%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 29 Jun, 2022 @ 9:11pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 29 Jun, 2022 @ 9:59pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 3 Jul, 2022 @ 6:57am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 15 Aug, 2023 @ 9:51pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 29 Jun, 2022 @ 9:10pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 15 Aug, 2023 @ 8:25pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 15 Aug, 2023 @ 8:48am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 15 Aug, 2023 @ 8:49pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 15 Aug, 2023 @ 9:52pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 6 Jul, 2022 @ 11:13pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 15 Aug, 2023 @ 10:56pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 30 Jun, 2022 @ 2:07am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 3 Jul, 2022 @ 6:43am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 3 Jul, 2022 @ 3:17am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 15 Aug, 2023 @ 10:27pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 30 Jun, 2022 @ 2:14am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 15 Aug, 2023 @ 10:54pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 29 Jun, 2022 @ 9:54pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 29 Jun, 2022 @ 9:17pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 15 Aug, 2023 @ 9:52pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 15 Aug, 2023 @ 7:18pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 29 Jun, 2022 @ 9:28pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 15 Aug, 2023 @ 9:46am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 15 Aug, 2023 @ 9:03pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 16 Aug, 2023 @ 2:58am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 15 Aug, 2023 @ 10:56pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 15 Aug, 2023 @ 10:27pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 15 Aug, 2023 @ 11:31pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 3 Jul, 2022 @ 3:11am

Following the Rules

Use the welcome mat.
Unlocked 16 Aug, 2023 @ 12:32am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 16 Aug, 2023 @ 2:45am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 16 Aug, 2023 @ 2:56am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 16 Aug, 2023 @ 4:34am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 16 Aug, 2023 @ 4:35am

Well-Done

Cook a Grenade for too long.
Unlocked 3 Jul, 2022 @ 3:17am



Rare Specimen

Send the Hidden Hat to Xen.

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.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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.​
+5

5 hidden achievements remaining

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