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47 of 50 (94%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 13 Sep, 2015 @ 7:39pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 14 Sep, 2015 @ 6:45pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 3 Jan, 2018 @ 4:31pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 21 Feb, 2020 @ 6:28pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 13 Sep, 2015 @ 7:38pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 1 Jan, 2018 @ 8:31pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 20 Feb, 2020 @ 5:10pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 20 Feb, 2020 @ 7:55pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 20 Feb, 2020 @ 7:47pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 14 Sep, 2015 @ 7:17pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 29 Sep, 2015 @ 5:58pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 17 Feb, 2020 @ 2:43pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 26 Feb, 2020 @ 9:27pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 9 Dec, 2019 @ 7:43pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 18 Sep, 2015 @ 8:40am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 14 Sep, 2015 @ 6:18pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 10 Dec, 2019 @ 9:06pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 17 Feb, 2020 @ 2:35pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 13 Sep, 2015 @ 7:34pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 9 Dec, 2019 @ 9:16pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 21 Feb, 2020 @ 9:21pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 15 Sep, 2015 @ 7:24am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 17 Feb, 2020 @ 2:25pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 20 Feb, 2020 @ 4:46pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 20 Feb, 2020 @ 7:47pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 6 Mar, 2020 @ 9:17pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 23 Feb, 2020 @ 8:51pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 26 Feb, 2020 @ 11:12pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 21 Feb, 2020 @ 7:35pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 21 Feb, 2020 @ 9:29pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 6 Mar, 2020 @ 5:35pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 6 Mar, 2020 @ 4:59pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 21 Feb, 2020 @ 9:40pm

Following the Rules

Use the welcome mat.
Unlocked 6 Mar, 2020 @ 6:01pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 22 Feb, 2020 @ 8:53pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 6 Mar, 2020 @ 7:28pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 6 Mar, 2020 @ 8:02pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 6 Mar, 2020 @ 8:07pm

Contest Propellant

Find the snack supply canister.
Unlocked 6 Mar, 2020 @ 9:00pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 6 Mar, 2020 @ 8:42pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 23 Feb, 2020 @ 5:26pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 28 Feb, 2020 @ 5:09pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 28 Feb, 2020 @ 5:10pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 23 Feb, 2020 @ 8:54pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 23 Feb, 2020 @ 8:54pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 28 Feb, 2020 @ 5:12pm

Well-Done

Cook a Grenade for too long.
Unlocked 21 Feb, 2020 @ 9:25pm



Prolific Popper

Kill all Protozoans in the Borderworld.

Post-Mortem Interval

Find each member of the missing research teams.

Laser Immunization

Complete Interloper without taking any laser damage.