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Brownian Motion

Pass the toilet paper to the Scientist in need.
Mở khóa vào 30 Thg11, 2020 @ 2:51am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Mở khóa vào 2 Thg09, 2022 @ 12:28am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Mở khóa vào 1 Thg12, 2020 @ 8:15am

Convection Refinement

Ruin the microwave casserole.
Mở khóa vào 30 Thg11, 2020 @ 2:50am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Mở khóa vào 4 Thg12, 2022 @ 10:54am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Ethically Questionable

Conduct all of the questionable research experiments.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Futile Resistance

Kill 10 Enemies with Snarks.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Mở khóa vào 11 Thg08, 2022 @ 7:54am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Inflammatory Actions

Kill a Headcrab using fire.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Mega Hertz

Kill 5 Enemies with one Grenade.
Mở khóa vào 9 Thg08, 2022 @ 10:59pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Permeable Infrastructure

Use the alternate path in Office Complex.
Mở khóa vào 30 Thg11, 2020 @ 4:41am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Mở khóa vào 9 Thg02, 2022 @ 10:18am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Mở khóa vào 30 Thg11, 2020 @ 11:40pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Mở khóa vào 30 Thg11, 2020 @ 2:48am

Quantum Capacitance

Overcharge it anyway.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Rare Specimen

Send the Hidden Hat to Xen.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Remote Detonation

Kill a Barnacle with a Satchel.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Mở khóa vào 3 Thg09, 2022 @ 1:08am

Universal Gravitation

Get killed by your own Snarks.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Prolific Popper

Kill all Protozoans in the Borderworld.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Mở khóa vào 4 Thg09, 2022 @ 11:39pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Mở khóa vào 6 Thg12, 2022 @ 4:06am

xen when

Wait too long to jump into the Lambda Teleporter.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Following the Rules

Use the welcome mat.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Post-Mortem Interval

Find each member of the missing research teams.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

The Plan

Use Cyanogen to kill Gonarch.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Contest Propellant

Find the snack supply canister.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Laser Immunization

Complete Interloper without taking any laser damage.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Mở khóa vào 11 Thg08, 2022 @ 5:42am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Mở khóa vào 11 Thg08, 2022 @ 5:38am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Mở khóa vào 1 Thg02, 2021 @ 7:14am

Limitless Potential

Accept G-Man’s offer of employment.
Mở khóa vào 3 Thg12, 2020 @ 12:28am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Mở khóa vào 1 Thg12, 2020 @ 12:09pm

Pepperoni Precipitation

View the *other* secret ending.
Mở khóa vào 21 Thg05, 2023 @ 3:11am

Well-Done

Cook a Grenade for too long.
Mở khóa vào 4 Thg12, 2022 @ 10:39am