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45 of 50 (90%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 21 Dec, 2018 @ 8:19am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 15 Nov, 2019 @ 10:44am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 21 Dec, 2018 @ 12:39pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 8 Feb, 2019 @ 2:38am

Convection Refinement

Ruin the microwave casserole.
Unlocked 21 Dec, 2018 @ 8:19am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 9 Jan, 2019 @ 6:19am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 7 Jan, 2019 @ 1:03pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 8 Feb, 2019 @ 2:17am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 17 Nov, 2019 @ 5:30am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 21 Dec, 2018 @ 12:17pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 9 Jan, 2019 @ 6:28am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 12 Nov, 2019 @ 6:07am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 12 Nov, 2019 @ 5:41am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 18 Nov, 2019 @ 4:57am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 17 Nov, 2019 @ 6:51am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 8 Feb, 2019 @ 2:54am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 8 Feb, 2019 @ 2:35am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 21 Dec, 2018 @ 11:41am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 21 Dec, 2018 @ 8:10am

Quantum Capacitance

Overcharge it anyway.
Unlocked 6 Jan, 2019 @ 7:29am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 19 Nov, 2019 @ 9:13am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 8 Jan, 2019 @ 6:09am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 15 Nov, 2019 @ 11:05am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 18 Nov, 2019 @ 5:57am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 6 Jan, 2019 @ 7:17am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 20 May, 2024 @ 3:50pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 29 Jul, 2020 @ 1:30am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 25 Jul, 2020 @ 10:16am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 19 Nov, 2020 @ 1:21am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 28 Jul, 2020 @ 4:18am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 28 Jul, 2020 @ 4:37am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 19 Nov, 2020 @ 2:35am

Following the Rules

Use the welcome mat.
Unlocked 28 Jul, 2020 @ 4:56am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 6 Aug, 2020 @ 11:15am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 16 Apr, 2024 @ 5:43am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 18 May, 2024 @ 2:08pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 18 May, 2024 @ 2:09pm

Contest Propellant

Find the snack supply canister.
Unlocked 6 Aug, 2020 @ 11:31am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 19 Nov, 2020 @ 1:54am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 6 Aug, 2020 @ 11:25am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 20 May, 2024 @ 4:08pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 20 May, 2024 @ 4:09pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 20 May, 2024 @ 4:14pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 20 May, 2024 @ 4:12pm

Well-Done

Cook a Grenade for too long.
Unlocked 25 Jul, 2020 @ 4:23am



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.
+2

2 hidden achievements remaining

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