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Brownian Motion

Pass the toilet paper to the Scientist in need.
Ξεκλειδώθηκε στις 2 Μαϊ 2018, 5:20

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Ξεκλειδώθηκε στις 20 Αυγ 2018, 14:15

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Ξεκλειδώθηκε στις 6 Αυγ 2018, 7:11

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Ξεκλειδώθηκε στις 23 Αυγ 2018, 14:13

Convection Refinement

Ruin the microwave casserole.
Ξεκλειδώθηκε στις 2 Μαϊ 2018, 5:19

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Ξεκλειδώθηκε στις 20 Αυγ 2018, 14:34

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Ξεκλειδώθηκε στις 28 Αυγ 2018, 15:51

Ethically Questionable

Conduct all of the questionable research experiments.
Ξεκλειδώθηκε στις 21 Αυγ 2018, 4:23

Futile Resistance

Kill 10 Enemies with Snarks.
Ξεκλειδώθηκε στις 23 Αυγ 2018, 14:09

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Ξεκλειδώθηκε στις 22 Ιουλ 2018, 13:04

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Ξεκλειδώθηκε στις 25 Αυγ 2018, 11:26

Inflammatory Actions

Kill a Headcrab using fire.
Ξεκλειδώθηκε στις 28 Αυγ 2018, 15:44

Kinetic Repulsion

Kill a Marine with their own Grenade.
Ξεκλειδώθηκε στις 21 Αυγ 2018, 5:05

Mega Hertz

Kill 5 Enemies with one Grenade.
Ξεκλειδώθηκε στις 30 Αυγ 2018, 13:41

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Ξεκλειδώθηκε στις 23 Αυγ 2018, 15:11

Permeable Infrastructure

Use the alternate path in Office Complex.
Ξεκλειδώθηκε στις 5 Μαϊ 2018, 14:35

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Ξεκλειδώθηκε στις 25 Αυγ 2018, 11:20

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Ξεκλειδώθηκε στις 5 Μαϊ 2018, 16:04

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Ξεκλειδώθηκε στις 2 Μαϊ 2018, 5:10

Quantum Capacitance

Overcharge it anyway.
Ξεκλειδώθηκε στις 21 Αυγ 2018, 4:24

Rare Specimen

Send the Hidden Hat to Xen.
Ξεκλειδώθηκε στις 30 Αυγ 2018, 14:11

Remote Detonation

Kill a Barnacle with a Satchel.
Ξεκλειδώθηκε στις 5 Αυγ 2018, 13:30

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Ξεκλειδώθηκε στις 20 Αυγ 2018, 14:29

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Ξεκλειδώθηκε στις 28 Αυγ 2018, 15:32

Universal Gravitation

Get killed by your own Snarks.
Ξεκλειδώθηκε στις 21 Αυγ 2018, 4:18



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

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.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.

Well-Done

Cook a Grenade for too long.
+7

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