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39 of 50 (78%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 27 Dec, 2017 @ 4:28pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 28 Jan, 2018 @ 3:45pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 11 May, 2018 @ 6:11pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 5 Jan, 2018 @ 7:47pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 27 Dec, 2017 @ 4:27pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 6 Jan, 2018 @ 5:04pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 31 Dec, 2020 @ 5:56pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 31 Dec, 2017 @ 3:28pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 6 Jan, 2018 @ 4:55pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 29 Dec, 2017 @ 4:20pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 6 Jan, 2018 @ 5:47pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 27 Dec, 2017 @ 5:00pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 31 Dec, 2020 @ 6:00pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 16 Feb, 2020 @ 5:34pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 6 Jan, 2018 @ 4:38pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 5 Jun, 2020 @ 11:36pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 6 Jan, 2018 @ 7:31pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 29 Dec, 2017 @ 4:40pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 29 Apr, 2018 @ 7:16pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 5 Jan, 2018 @ 7:10pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 18 May, 2018 @ 6:33pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 6 Jan, 2018 @ 4:35pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 7 Jan, 2018 @ 6:03pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 8 Jun, 2020 @ 8:04pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 5 Jan, 2018 @ 7:55pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 10 Jun, 2020 @ 1:07pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 8 Jun, 2020 @ 3:52pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 24 Dec, 2020 @ 1:37pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 20 Feb, 2020 @ 7:17pm

Following the Rules

Use the welcome mat.
Unlocked 8 Jun, 2020 @ 11:55pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 16 Feb, 2020 @ 5:35pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 9 Jun, 2020 @ 12:12pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 9 Jun, 2020 @ 2:25pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 9 Jun, 2020 @ 2:26pm

Contest Propellant

Find the snack supply canister.
Unlocked 9 Jun, 2020 @ 2:40pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 16 Feb, 2020 @ 5:51pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 16 Feb, 2020 @ 8:40pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 16 Feb, 2020 @ 8:39pm

Well-Done

Cook a Grenade for too long.
Unlocked 8 Jun, 2020 @ 12:40pm



Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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.​
+3

3 hidden achievements remaining

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