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Brownian Motion

Pass the toilet paper to the Scientist in need.
Mở khóa vào 18 Thg02, 2018 @ 12:35pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Mở khóa vào 19 Thg02, 2018 @ 12:47pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Mở khóa vào 19 Thg02, 2018 @ 1:29am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Mở khóa vào 22 Thg02, 2018 @ 8:29am

Convection Refinement

Ruin the microwave casserole.
Mở khóa vào 18 Thg02, 2018 @ 12:35pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Mở khóa vào 22 Thg02, 2018 @ 7:54am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Mở khóa vào 7 Thg01, 2020 @ 9:59am

Ethically Questionable

Conduct all of the questionable research experiments.
Mở khóa vào 22 Thg02, 2018 @ 8:26am

Futile Resistance

Kill 10 Enemies with Snarks.
Mở khóa vào 22 Thg02, 2018 @ 12:35pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Mở khóa vào 18 Thg02, 2018 @ 11:52pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Mở khóa vào 21 Thg02, 2018 @ 8:58am

Inflammatory Actions

Kill a Headcrab using fire.
Mở khóa vào 22 Thg02, 2018 @ 8:21am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Mở khóa vào 7 Thg01, 2020 @ 9:55am

Mega Hertz

Kill 5 Enemies with one Grenade.
Mở khóa vào 22 Thg02, 2018 @ 12:42pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Mở khóa vào 23 Thg02, 2018 @ 12:43am

Permeable Infrastructure

Use the alternate path in Office Complex.
Mở khóa vào 22 Thg02, 2018 @ 12:06pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Mở khóa vào 22 Thg02, 2018 @ 8:02am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Mở khóa vào 18 Thg02, 2018 @ 1:05pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Mở khóa vào 22 Thg02, 2018 @ 11:49am

Quantum Capacitance

Overcharge it anyway.
Mở khóa vào 22 Thg02, 2018 @ 7:55am

Rare Specimen

Send the Hidden Hat to Xen.
Mở khóa vào 12 Thg06, 2018 @ 7:37am

Remote Detonation

Kill a Barnacle with a Satchel.
Mở khóa vào 22 Thg02, 2018 @ 11:42am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Mở khóa vào 22 Thg02, 2018 @ 8:17am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Mở khóa vào 23 Thg02, 2018 @ 12:33am

Universal Gravitation

Get killed by your own Snarks.
Mở khóa vào 19 Thg02, 2018 @ 1:03pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Mở khóa vào 2 Thg09, 2020 @ 4:02am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Mở khóa vào 25 Thg08, 2020 @ 9:41am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Mở khóa vào 30 Thg08, 2020 @ 4:53am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Mở khóa vào 21 Thg08, 2020 @ 6:31am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Mở khóa vào 21 Thg08, 2020 @ 4:52am

xen when

Wait too long to jump into the Lambda Teleporter.
Mở khóa vào 25 Thg08, 2020 @ 11:50am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Mở khóa vào 22 Thg08, 2020 @ 7:25am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Mở khóa vào 21 Thg08, 2020 @ 4:59am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Mở khóa vào 21 Thg08, 2020 @ 5:59am

Following the Rules

Use the welcome mat.
Mở khóa vào 21 Thg08, 2020 @ 7:17am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Mở khóa vào 21 Thg08, 2020 @ 12:01pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Mở khóa vào 22 Thg08, 2020 @ 6:57am

Post-Mortem Interval

Find each member of the missing research teams.
Mở khóa vào 21 Thg08, 2020 @ 12:49pm

The Plan

Use Cyanogen to kill Gonarch.
Mở khóa vào 25 Thg08, 2020 @ 2:38pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Mở khóa vào 25 Thg08, 2020 @ 2:40pm

Contest Propellant

Find the snack supply canister.
Mở khóa vào 25 Thg08, 2020 @ 11:40am

Laser Immunization

Complete Interloper without taking any laser damage.
Mở khóa vào 25 Thg08, 2020 @ 9:41am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Mở khóa vào 25 Thg08, 2020 @ 11:26am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Mở khóa vào 19 Thg05, 2020 @ 3:16am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Mở khóa vào 25 Thg08, 2020 @ 8:20am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Mở khóa vào 25 Thg08, 2020 @ 11:32am

Limitless Potential

Accept G-Man’s offer of employment.
Mở khóa vào 17 Thg08, 2020 @ 5:16am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Mở khóa vào 17 Thg08, 2020 @ 5:17am

Pepperoni Precipitation

View the *other* secret ending.
Mở khóa vào 26 Thg08, 2020 @ 3:44pm

Well-Done

Cook a Grenade for too long.
Mở khóa vào 24 Thg03, 2020 @ 5:22am