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33 of 50 (66%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 8 Aug, 2015 @ 5:05pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 8 Aug, 2015 @ 6:08pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 15 Aug, 2015 @ 8:38pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 15 Aug, 2015 @ 8:55pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 8 Aug, 2015 @ 5:04pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 15 Aug, 2015 @ 9:30pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 15 Aug, 2015 @ 9:36pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 15 Aug, 2015 @ 10:19pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 15 Aug, 2015 @ 9:02pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 8 Aug, 2015 @ 6:20pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 10 Aug, 2015 @ 12:00am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 8 Aug, 2015 @ 5:24pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 15 Aug, 2015 @ 9:47pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 10 Aug, 2015 @ 12:06am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 15 Aug, 2015 @ 8:54pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 15 Aug, 2015 @ 9:57pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 10 Aug, 2015 @ 12:04am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 15 Aug, 2015 @ 8:35pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 10 Aug, 2015 @ 1:17am

Quantum Capacitance

Overcharge it anyway.
Unlocked 10 Aug, 2015 @ 12:04am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 13 Nov, 2018 @ 3:52am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 8 Aug, 2015 @ 9:21pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 10 Aug, 2015 @ 1:30am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 15 Aug, 2015 @ 8:49pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 15 Aug, 2015 @ 8:28pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 28 Oct, 2020 @ 1:19am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 16 Dec, 2020 @ 9:40am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 1 Jul, 2020 @ 8:53pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 27 Oct, 2020 @ 3:49am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 28 Oct, 2020 @ 1:45am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 28 Oct, 2020 @ 1:54am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 28 Oct, 2020 @ 1:55am

Well-Done

Cook a Grenade for too long.
Unlocked 17 Dec, 2020 @ 2:37am



Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Our Brains And Your Brawn

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

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

Gonad Glider

Get whacked into oblivion in the ledge fight.

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.

Late for Work

Defeat Nihilanth in under 4 minutes.​
+7

7 hidden achievements remaining

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