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37 of 50 (74%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 5 May, 2015 @ 4:15pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 5 May, 2015 @ 4:35pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 9 May, 2015 @ 9:39am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 12 May, 2015 @ 9:27am

Convection Refinement

Ruin the microwave casserole.
Unlocked 5 May, 2015 @ 4:13pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 9 May, 2015 @ 7:52pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 9 May, 2015 @ 9:11am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 11 May, 2015 @ 3:55pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 11 May, 2015 @ 4:09pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 7 May, 2015 @ 6:51am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 13 May, 2015 @ 7:52am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 5 May, 2015 @ 4:40pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 9 May, 2015 @ 9:27am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 9 May, 2015 @ 8:48am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 11 May, 2015 @ 4:26pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 6 May, 2015 @ 9:29am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 13 May, 2015 @ 7:48am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 7 May, 2015 @ 6:11pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 5 May, 2015 @ 4:42pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 11 May, 2015 @ 3:51pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 14 May, 2015 @ 5:01pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 9 May, 2015 @ 1:16pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 6 May, 2015 @ 6:20am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 9 May, 2015 @ 1:35pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 11 May, 2015 @ 3:49pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 19 Mar, 2020 @ 10:14pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 11 Mar, 2020 @ 10:21am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 10 Mar, 2020 @ 2:28pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 10 Mar, 2020 @ 1:13pm

Following the Rules

Use the welcome mat.
Unlocked 6 Mar, 2020 @ 1:47am

Contest Propellant

Find the snack supply canister.
Unlocked 9 Mar, 2020 @ 7:31am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 9 Mar, 2020 @ 7:29am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 20 Mar, 2020 @ 10:49am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 20 Mar, 2020 @ 10:50am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 19 Mar, 2020 @ 10:46pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 20 Mar, 2020 @ 10:54am

Well-Done

Cook a Grenade for too long.
Unlocked 10 Mar, 2020 @ 2:33pm



Prolific Popper

Kill all Protozoans in the Borderworld.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

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.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked