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43 of 50 (86%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 8 Mar, 2020 @ 9:12am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 22 Mar, 2020 @ 10:16am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 15 Mar, 2020 @ 4:27pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 22 Mar, 2020 @ 12:47pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 8 Mar, 2020 @ 9:09am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 22 Mar, 2020 @ 12:09pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 22 Mar, 2020 @ 11:41am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 22 Mar, 2020 @ 10:23am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 29 Mar, 2020 @ 10:32am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 21 Mar, 2020 @ 8:16am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 22 Mar, 2020 @ 12:57pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 17 Mar, 2020 @ 6:41pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 21 Mar, 2020 @ 9:38am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 15 Mar, 2020 @ 5:10pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Mar, 2020 @ 7:48am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 22 Mar, 2020 @ 10:47am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 22 Mar, 2020 @ 12:48pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 22 Mar, 2020 @ 10:54am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 8 Mar, 2020 @ 8:57am

Quantum Capacitance

Overcharge it anyway.
Unlocked 17 Mar, 2020 @ 6:52pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 22 Mar, 2020 @ 11:11am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 22 Mar, 2020 @ 10:31am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 29 Mar, 2020 @ 10:55am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 29 Mar, 2020 @ 10:34am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 28 Mar, 2020 @ 12:49pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 29 Mar, 2020 @ 10:29am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 22 Mar, 2020 @ 11:19am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 29 Mar, 2020 @ 10:00am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 25 Mar, 2020 @ 3:06pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 28 Mar, 2020 @ 10:08am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 28 Mar, 2020 @ 8:23am

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 5 Apr, 2020 @ 9:35am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 5 Apr, 2020 @ 9:38am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 5 Apr, 2020 @ 9:40am

Contest Propellant

Find the snack supply canister.
Unlocked 28 Mar, 2020 @ 10:24am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 28 Mar, 2020 @ 12:49pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 28 Mar, 2020 @ 11:09am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 28 Mar, 2020 @ 10:22am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 28 Mar, 2020 @ 1:22pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 5 Apr, 2020 @ 12:52pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 28 Mar, 2020 @ 1:27pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 29 Mar, 2020 @ 3:20pm

Well-Done

Cook a Grenade for too long.
Unlocked 11 Mar, 2020 @ 4:36pm



Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
+4

4 hidden achievements remaining

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