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40 of 50 (80%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 31 Jan, 2017 @ 10:15am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 31 Jan, 2017 @ 10:38am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 26 Feb, 2017 @ 2:59am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 26 Feb, 2017 @ 7:51am

Convection Refinement

Ruin the microwave casserole.
Unlocked 31 Jan, 2017 @ 10:12am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 26 Feb, 2017 @ 10:21am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 26 Feb, 2017 @ 11:32pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 26 Feb, 2017 @ 11:31am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 26 Feb, 2017 @ 9:38am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 26 Feb, 2017 @ 2:31am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 27 Feb, 2017 @ 1:01am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 31 Jan, 2017 @ 10:47am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 26 Feb, 2017 @ 7:24am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 26 Feb, 2017 @ 2:50am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 26 Feb, 2017 @ 10:10am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 27 Feb, 2017 @ 2:29am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 26 Feb, 2017 @ 12:42pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 31 Jan, 2017 @ 10:58am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 31 Jan, 2017 @ 10:11am

Quantum Capacitance

Overcharge it anyway.
Unlocked 26 Feb, 2017 @ 10:09am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 27 Feb, 2017 @ 2:15am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 26 Feb, 2017 @ 2:57am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 31 Jan, 2017 @ 10:26am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 26 Feb, 2017 @ 7:52am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 26 Feb, 2017 @ 7:34am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 22 Jun, 2020 @ 10:55am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 12 Aug, 2022 @ 12:32pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 21 Jun, 2020 @ 5:12pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 13 Aug, 2022 @ 5:50am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 12 Aug, 2022 @ 7:52am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 12 Aug, 2022 @ 4:36am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 13 Aug, 2022 @ 6:20am

Following the Rules

Use the welcome mat.
Unlocked 13 Aug, 2022 @ 6:34am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 22 Jun, 2020 @ 7:23am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 22 Jun, 2020 @ 7:40am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 22 Jun, 2020 @ 11:29am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 22 Jun, 2020 @ 1:47pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 22 Jun, 2020 @ 11:36am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 22 Jun, 2020 @ 1:51pm

Well-Done

Cook a Grenade for too long.
Unlocked 12 Aug, 2022 @ 5:05am



Prolific Popper

Kill all Protozoans in the Borderworld.

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.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked