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28 of 50 (56%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 1 Jul, 2017 @ 7:01pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 9 Jul, 2017 @ 1:14am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 29 Jul, 2017 @ 1:52am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 26 Jul, 2017 @ 10:45am

Convection Refinement

Ruin the microwave casserole.
Unlocked 1 Jul, 2017 @ 7:00pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 25 Jul, 2017 @ 10:32pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 29 Jul, 2017 @ 2:04am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 29 Jul, 2017 @ 2:56am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 29 Jul, 2017 @ 1:48am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 9 Jul, 2017 @ 3:36am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 25 Jul, 2017 @ 10:52pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 1 Jul, 2017 @ 7:14pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 29 Jul, 2017 @ 2:06am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 29 Jul, 2017 @ 1:59am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 29 Jul, 2017 @ 2:41am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 9 Jul, 2017 @ 1:10am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 25 Jul, 2017 @ 10:50pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 1 Jul, 2017 @ 7:28pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 1 Jul, 2017 @ 3:25pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 25 Jul, 2017 @ 10:34pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 2 Oct, 2017 @ 3:14pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 26 Jul, 2017 @ 10:45am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 1 Jul, 2017 @ 7:08pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 1 Jul, 2017 @ 7:33pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 29 Jul, 2017 @ 1:46am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 13 Aug, 2022 @ 4:16pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 13 Aug, 2022 @ 7:09pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 13 Aug, 2022 @ 7:07pm



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts 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.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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.

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.

Late for Work

Defeat Nihilanth in under 4 minutes.​

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked