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Brownian Motion

Pass the toilet paper to the Scientist in need.
Desbloqueada a 6 mar. 2021 às 13:58

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Desbloqueada a 9 mar. 2021 às 11:28

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Desbloqueada a 9 mar. 2021 às 11:28

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Desbloqueada a 9 jul. 2021 às 7:52

Convection Refinement

Ruin the microwave casserole.
Desbloqueada a 6 mar. 2021 às 13:57

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Desbloqueada a 10 mar. 2021 às 7:11

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Desbloqueada a 9 mar. 2021 às 3:22

Ethically Questionable

Conduct all of the questionable research experiments.
Desbloqueada a 9 jul. 2021 às 8:18

Futile Resistance

Kill 10 Enemies with Snarks.
Desbloqueada a 12 mar. 2021 às 8:03

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Desbloqueada a 10 mar. 2021 às 7:46

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Desbloqueada a 10 jul. 2021 às 18:09

Inflammatory Actions

Kill a Headcrab using fire.
Desbloqueada a 13 mar. 2021 às 8:34

Kinetic Repulsion

Kill a Marine with their own Grenade.
Desbloqueada a 9 jul. 2021 às 8:12

Mega Hertz

Kill 5 Enemies with one Grenade.
Desbloqueada a 10 jul. 2021 às 10:52

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Desbloqueada a 11 mar. 2021 às 12:40

Permeable Infrastructure

Use the alternate path in Office Complex.
Desbloqueada a 11 jul. 2021 às 9:39

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Desbloqueada a 12 mar. 2021 às 9:25

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Desbloqueada a 7 mar. 2021 às 18:48

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Desbloqueada a 6 mar. 2021 às 13:55

Quantum Capacitance

Overcharge it anyway.
Desbloqueada a 10 mar. 2021 às 7:50

Rare Specimen

Send the Hidden Hat to Xen.
Desbloqueada a 16 mar. 2021 às 13:14

Remote Detonation

Kill a Barnacle with a Satchel.
Desbloqueada a 8 mar. 2021 às 13:14

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Desbloqueada a 14 mar. 2021 às 1:20

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Desbloqueada a 10 jul. 2021 às 18:20

Universal Gravitation

Get killed by your own Snarks.
Desbloqueada a 12 mar. 2021 às 1:04

Prolific Popper

Kill all Protozoans in the Borderworld.
Desbloqueada a 12 jul. 2021 às 16:05

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Desbloqueada a 9 jul. 2021 às 10:27

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Desbloqueada a 19 mar. 2021 às 12:32

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Desbloqueada a 11 jul. 2021 às 9:36

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Desbloqueada a 11 jul. 2021 às 8:25

xen when

Wait too long to jump into the Lambda Teleporter.
Desbloqueada a 11 jul. 2021 às 5:30

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Desbloqueada a 11 jul. 2021 às 12:32

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Desbloqueada a 11 jul. 2021 às 8:33

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Desbloqueada a 11 jul. 2021 às 12:35

Following the Rules

Use the welcome mat.
Desbloqueada a 11 jul. 2021 às 6:35

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Desbloqueada a 12 jul. 2021 às 5:50

Gonad Glider

Get whacked into oblivion in the ledge fight.
Desbloqueada a 12 jul. 2021 às 5:11

Post-Mortem Interval

Find each member of the missing research teams.
Desbloqueada a 12 jul. 2021 às 16:39

The Plan

Use Cyanogen to kill Gonarch.
Desbloqueada a 12 jul. 2021 às 8:48

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Desbloqueada a 12 jul. 2021 às 8:48

Contest Propellant

Find the snack supply canister.
Desbloqueada a 9 jul. 2021 às 10:33

Laser Immunization

Complete Interloper without taking any laser damage.
Desbloqueada a 11 jul. 2021 às 13:49

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Desbloqueada a 9 jul. 2021 às 10:39

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Desbloqueada a 13 mar. 2021 às 9:21

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Desbloqueada a 11 jul. 2021 às 8:09

Late for Work

Defeat Nihilanth in under 4 minutes.​
Desbloqueada a 19 mar. 2021 às 12:30

Limitless Potential

Accept G-Man’s offer of employment.
Desbloqueada a 14 mar. 2021 às 1:08

Rather an Anticlimax

Decline G-Man’s offer of employment.
Desbloqueada a 14 mar. 2021 às 1:06

Pepperoni Precipitation

View the *other* secret ending.
Desbloqueada a 12 jul. 2021 às 7:23

Well-Done

Cook a Grenade for too long.
Desbloqueada a 9 mar. 2021 às 3:24