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30 of 50 (60%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 25 Jul, 2023 @ 1:18pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 27 Jul, 2023 @ 10:34am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 27 Jul, 2023 @ 12:29pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 24 Aug, 2023 @ 10:24am

Convection Refinement

Ruin the microwave casserole.
Unlocked 25 Jul, 2023 @ 1:16pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 29 Jul, 2023 @ 10:54am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 27 Jul, 2023 @ 1:02pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 27 Jul, 2023 @ 1:28pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 24 Aug, 2023 @ 11:29am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 25 Jul, 2023 @ 1:41pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 27 Jul, 2023 @ 1:42pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 26 Aug, 2023 @ 8:55am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 23 Aug, 2023 @ 2:20pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 29 Jul, 2023 @ 11:46am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 27 Jul, 2023 @ 1:30pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 29 Jul, 2023 @ 12:07pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 5 Sep, 2023 @ 2:47pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 23 Aug, 2023 @ 1:09pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 26 Aug, 2023 @ 8:42am

Following the Rules

Use the welcome mat.
Unlocked 26 Aug, 2023 @ 9:01am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 5 Sep, 2023 @ 12:49pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 5 Sep, 2023 @ 9:57am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 5 Sep, 2023 @ 2:47pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 5 Sep, 2023 @ 12:57pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 13 Sep, 2023 @ 11:18am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 13 Sep, 2023 @ 11:19am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 13 Sep, 2023 @ 11:24am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 13 Sep, 2023 @ 11:23am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 13 Sep, 2023 @ 11:20am

Well-Done

Cook a Grenade for too long.
Unlocked 23 Aug, 2023 @ 1:00pm



Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Mega Hertz

Kill 5 Enemies with one Grenade.

Permeable Infrastructure

Use the alternate path in Office Complex.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

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.

Post-Mortem Interval

Find each member of the missing research teams.

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked