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34 of 50 (68%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 21 Feb, 2022 @ 1:54pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 21 Feb, 2022 @ 2:14pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 23 Feb, 2022 @ 2:56am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 25 Feb, 2022 @ 11:35am

Convection Refinement

Ruin the microwave casserole.
Unlocked 21 Feb, 2022 @ 1:52pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 24 Feb, 2022 @ 12:47pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 23 Feb, 2022 @ 1:49am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 25 Feb, 2022 @ 8:36am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 24 Feb, 2022 @ 1:27pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 24 Feb, 2022 @ 11:38am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 21 Feb, 2022 @ 2:17pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 23 Feb, 2022 @ 2:04am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 25 Feb, 2022 @ 9:00am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 23 Feb, 2022 @ 1:27am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 25 Feb, 2022 @ 11:49am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 23 Feb, 2022 @ 12:50am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 21 Feb, 2022 @ 1:49pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 25 Feb, 2022 @ 8:32am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 26 Feb, 2022 @ 1:32am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 23 Feb, 2022 @ 2:37am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 21 Feb, 2022 @ 2:07pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 25 Feb, 2022 @ 10:48am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 24 Feb, 2022 @ 1:25pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 1 Mar, 2022 @ 5:40am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 25 Feb, 2022 @ 10:27am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 25 Feb, 2022 @ 10:54am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 26 Feb, 2022 @ 1:32am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 23 Feb, 2022 @ 1:42am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 21 Feb, 2022 @ 2:05pm

Following the Rules

Use the welcome mat.
Unlocked 26 Feb, 2022 @ 1:48am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 28 Feb, 2022 @ 8:48am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 1 Mar, 2022 @ 5:43am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 1 Mar, 2022 @ 5:42am

Well-Done

Cook a Grenade for too long.
Unlocked 24 Feb, 2022 @ 12:04pm



Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Mega Hertz

Kill 5 Enemies with one Grenade.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.​
+4

4 hidden achievements remaining

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