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29 of 50 (58%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 29 Dec, 2015 @ 7:14pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 29 Dec, 2015 @ 8:05pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 30 Dec, 2015 @ 12:11pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 5 Apr @ 2:44pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 29 Dec, 2015 @ 7:13pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 30 Dec, 2015 @ 12:22pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 1 Jan, 2016 @ 11:22am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 30 Dec, 2015 @ 9:17am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 30 Dec, 2015 @ 4:14pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 9 Jan, 2016 @ 9:19pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 30 Dec, 2016 @ 5:02pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 11 Jan, 2016 @ 4:24pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 10 Jan, 2016 @ 6:40am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 30 Dec, 2015 @ 4:09pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 29 Dec, 2015 @ 8:11pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 9 Jan, 2016 @ 8:10pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 30 Dec, 2015 @ 1:17pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 6 Jan, 2017 @ 9:57pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 30 Dec, 2015 @ 1:13pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 5 Jan, 2021 @ 10:11am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 11 Jun, 2020 @ 4:52pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 5 Apr @ 2:37pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 17 Jun, 2020 @ 12:52pm

Contest Propellant

Find the snack supply canister.
Unlocked 4 Jan, 2021 @ 11:53pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 4 Jan, 2021 @ 11:51pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 24 Dec, 2020 @ 4:10am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 3 Dec, 2021 @ 7:44pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 24 Dec, 2020 @ 3:55am

Well-Done

Cook a Grenade for too long.
Unlocked 5 Apr @ 2:44pm



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

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.​

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.

Rather an Anticlimax

Decline G-Man’s offer of employment.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked