Black Mesa
HelloHalo's Progress
Brownian Motion
Pass the toilet paper to the Scientist in need.
Unlocked 7 Feb 2026 at 1:41 AM
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines.
Unlocked 7 Feb 2026 at 1:41 AM
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 7 Feb 2026 at 1:41 AM
Centripetal Attraction
Kill 20 Enemies with the Hivehand.
Unlocked 7 Feb 2026 at 1:41 AM
Convection Refinement
Ruin the microwave casserole.
Unlocked 7 Feb 2026 at 1:41 AM
Dead Reckoning
Kill an Assassin with the .357 Magnum.
Unlocked 7 Feb 2026 at 1:41 AM
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry.
Unlocked 7 Feb 2026 at 1:41 AM
Ethically Questionable
Conduct all of the questionable research experiments.
Unlocked 7 Feb 2026 at 1:41 AM
Futile Resistance
Kill 10 Enemies with Snarks.
Unlocked 7 Feb 2026 at 1:41 AM
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum.
Unlocked 7 Feb 2026 at 1:41 AM
Hyper Saturation Conundrum
Drown in Lambda Core's coolant.
Unlocked 7 Feb 2026 at 1:41 AM
Inflammatory Actions
Kill a Headcrab using fire.
Unlocked 7 Feb 2026 at 1:41 AM
Kinetic Repulsion
Kill a Marine with their own Grenade.
Unlocked 7 Feb 2026 at 1:41 AM
Mega Hertz
Kill 5 Enemies with one Grenade.
Unlocked 7 Feb 2026 at 1:41 AM
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 7 Feb 2026 at 1:41 AM
Permeable Infrastructure
Use the alternate path in Office Complex.
Unlocked 7 Feb 2026 at 1:41 AM
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 7 Feb 2026 at 1:41 AM
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior.
Unlocked 7 Feb 2026 at 1:41 AM
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 7 Feb 2026 at 1:41 AM
Quantum Capacitance
Overcharge it anyway.
Unlocked 7 Feb 2026 at 1:41 AM
Rare Specimen
Send the Hidden Hat to Xen.
Unlocked 7 Feb 2026 at 1:41 AM
Remote Detonation
Kill a Barnacle with a Satchel.
Unlocked 7 Feb 2026 at 1:41 AM
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 7 Feb 2026 at 1:41 AM
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love.
Unlocked 7 Feb 2026 at 1:41 AM
Universal Gravitation
Get killed by your own Snarks.
Unlocked 7 Feb 2026 at 1:41 AM
Prolific Popper
Kill all Protozoans in the Borderworld.
Unlocked 7 Feb 2026 at 1:41 AM
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld.
Unlocked 7 Feb 2026 at 1:41 AM
The Rarest Specimen
Unlocked 7 Feb 2026 at 1:41 AM
One Step Ahead
Kill 10 Enemies with Tripmines.
Unlocked 7 Feb 2026 at 1:41 AM
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 7 Feb 2026 at 1:41 AM
xen when
Unlocked 7 Feb 2026 at 1:41 AM
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 7 Feb 2026 at 1:41 AM
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment.
Unlocked 7 Feb 2026 at 1:41 AM
Orbital Trajectory
Skip the opening Xen island with a secret jump.
Unlocked 7 Feb 2026 at 1:41 AM
Following the Rules
Unlocked 7 Feb 2026 at 1:41 AM
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 7 Feb 2026 at 1:41 AM
Gonad Glider
Get whacked into oblivion in the ledge fight.
Unlocked 7 Feb 2026 at 1:41 AM
Post-Mortem Interval
Find each member of the missing research teams.
Unlocked 7 Feb 2026 at 1:41 AM
The Plan
Unlocked 7 Feb 2026 at 1:41 AM
Unquestionably Ethical
Unlocked 7 Feb 2026 at 1:41 AM
Contest Propellant
Unlocked 7 Feb 2026 at 1:41 AM
Laser Immunization
Complete Interloper without taking any laser damage.
Unlocked 7 Feb 2026 at 1:41 AM
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 7 Feb 2026 at 1:41 AM
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 7 Feb 2026 at 1:41 AM
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time.
Unlocked 7 Feb 2026 at 1:41 AM
Late for Work
Defeat Nihilanth in under 4 minutes.
Unlocked 7 Feb 2026 at 1:41 AM
Limitless Potential
Accept G-Man’s offer of employment.
Unlocked 7 Feb 2026 at 1:41 AM
Rather an Anticlimax
Decline G-Man’s offer of employment.
Unlocked 7 Feb 2026 at 1:41 AM
Pepperoni Precipitation
Unlocked 7 Feb 2026 at 1:41 AM
Well-Done
Cook a Grenade for too long.
Unlocked 7 Feb 2026 at 1:41 AM