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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 27 Jul, 2021 @ 11:06am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 27 Jul, 2021 @ 11:37am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 28 Jul, 2021 @ 8:44am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 24 Nov, 2019 @ 7:37am

Convection Refinement

Ruin the microwave casserole.
Unlocked 18 Nov, 2019 @ 12:19am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 1 Aug, 2021 @ 11:07am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 1 Aug, 2021 @ 3:45am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 1 Aug, 2021 @ 12:10pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 1 Aug, 2021 @ 12:26pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 25 Nov, 2019 @ 6:45am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 7 Aug, 2021 @ 9:02pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 27 Jul, 2021 @ 11:39am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 28 Jul, 2021 @ 9:12am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 28 Jul, 2021 @ 9:07am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 2 Aug, 2021 @ 10:18am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 18 Nov, 2019 @ 1:14am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 8 Dec, 2019 @ 5:43am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 27 Jul, 2021 @ 11:33am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 27 Jul, 2021 @ 11:16am

Quantum Capacitance

Overcharge it anyway.
Unlocked 1 Aug, 2021 @ 12:09pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 31 Jul, 2021 @ 10:54am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 27 Jul, 2021 @ 11:28am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 31 Jul, 2021 @ 10:54am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 1 Aug, 2021 @ 12:01pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 8 Aug, 2021 @ 6:22am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 8 Aug, 2021 @ 3:32am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 1 Aug, 2021 @ 4:06am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 6 Aug, 2021 @ 10:08am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 7 Aug, 2021 @ 9:38pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 8 Aug, 2021 @ 6:54am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 27 Jul, 2021 @ 11:25am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 7 Aug, 2021 @ 10:21pm

Following the Rules

Use the welcome mat.
Unlocked 7 Aug, 2021 @ 10:34pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 8 Aug, 2021 @ 1:25am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 8 Aug, 2021 @ 12:04am

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 8 Aug, 2021 @ 8:22am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 8 Aug, 2021 @ 6:22am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 8 Aug, 2021 @ 6:24am

Contest Propellant

Find the snack supply canister.
Unlocked 8 Aug, 2021 @ 2:07am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 8 Aug, 2021 @ 1:56am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 8 Aug, 2021 @ 1:36am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 8 Aug, 2021 @ 3:58am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 25 Jul, 2021 @ 9:07am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 8 Aug, 2021 @ 4:03am

Well-Done

Cook a Grenade for too long.
Unlocked 27 Jul, 2021 @ 8:31pm



Rare Specimen

Send the Hidden Hat to Xen.

Laser Immunization

Complete Interloper without taking any laser damage.

Late for Work

Defeat Nihilanth in under 4 minutes.​
+2

2 hidden achievements remaining

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