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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 9 Apr, 2020 @ 8:17pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 28 Mar, 2024 @ 9:00pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 29 Mar, 2024 @ 1:56pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 13 Apr, 2020 @ 3:39pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 9 Apr, 2020 @ 8:16pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 29 Mar, 2024 @ 12:14pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 13 Apr, 2020 @ 5:15pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 13 Apr, 2020 @ 6:59pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 25 Apr, 2020 @ 8:42pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 3 Aug, 2020 @ 4:57pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 11 Feb, 2021 @ 7:21pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 13 Apr, 2020 @ 1:47pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 20 Feb, 2023 @ 3:01pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 11 Feb, 2021 @ 7:36pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 7 Aug, 2020 @ 10:04pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 14 Apr, 2020 @ 3:54pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 6 Apr, 2024 @ 12:50pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 11 Feb, 2021 @ 7:31pm

Following the Rules

Use the welcome mat.
Unlocked 13 Apr, 2020 @ 5:20pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 5 Sep, 2020 @ 8:17pm

Contest Propellant

Find the snack supply canister.
Unlocked 25 Apr, 2020 @ 7:17pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 13 Apr, 2020 @ 7:48pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 14 Apr, 2020 @ 4:34pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 14 Apr, 2020 @ 4:34pm

Well-Done

Cook a Grenade for too long.
Unlocked 9 Apr, 2020 @ 9:53pm



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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Permeable Infrastructure

Use the alternate path in Office Complex.

Rare Specimen

Send the Hidden Hat to Xen.

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.

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

Details for each achievement will be revealed once unlocked