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41 of 50 (82%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 4 Aug, 2016 @ 10:24pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 5 Aug, 2016 @ 7:34pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 9 Aug, 2016 @ 7:19pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 24 Sep, 2016 @ 2:03pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 4 Aug, 2016 @ 10:22pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 17 Aug, 2016 @ 9:09pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 8 Aug, 2016 @ 7:56pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 19 Aug, 2016 @ 11:00pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 19 Aug, 2016 @ 10:51pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 5 Aug, 2016 @ 7:30pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 16 Sep, 2016 @ 9:19pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 4 Aug, 2016 @ 10:49pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 21 Aug, 2016 @ 9:53pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 9 Aug, 2016 @ 7:11pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 24 Aug, 2016 @ 9:11pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 5 Aug, 2016 @ 7:26pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 16 Sep, 2016 @ 9:22pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 4 Aug, 2016 @ 10:43pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 5 Aug, 2016 @ 6:45pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 19 Aug, 2016 @ 10:57pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 12 May, 2020 @ 10:23pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 12 Aug, 2016 @ 10:12pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 4 Aug, 2016 @ 11:05pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 5 Aug, 2016 @ 7:18pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 19 Aug, 2016 @ 10:50pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 21 Mar, 2020 @ 9:42pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 19 Feb @ 8:26pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 12 May, 2020 @ 10:19pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 9 May, 2020 @ 10:13pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 20 Mar, 2020 @ 10:36pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 26 Mar, 2020 @ 8:07pm

Following the Rules

Use the welcome mat.
Unlocked 26 Mar, 2020 @ 8:25pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 21 Feb @ 7:22am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 4 Apr, 2020 @ 9:04pm

Contest Propellant

Find the snack supply canister.
Unlocked 6 May, 2020 @ 9:41pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 6 May, 2020 @ 9:29pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 20 Feb @ 5:21am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 21 Feb @ 7:38am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 24 Mar, 2020 @ 9:52am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 24 Mar, 2020 @ 9:49am

Well-Done

Cook a Grenade for too long.
Unlocked 21 Mar, 2020 @ 9:36pm



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.
+4

4 hidden achievements remaining

Details for each achievement will be revealed once unlocked