Black Mesa - 2 of 50 earned
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Convection RefinementRuin the microwave casserole.Aug 18
Brownian MotionPass the toilet paper to the Scientist in need.May 7
Caffeine ExtractionPerform surgical caffeine extraction from 20 vending machines.Locked
Calculated TrajectoryKill 10 airborne Headcrabs using the Shotgun.Locked
Centripetal AttractionKill 20 Enemies with the Hivehand.Locked
Dead ReckoningKill an Assassin with the .357 Magnum.Locked
Digital WizardryKill 10 enemies with a reprogrammed Sentry.Locked
Ethically QuestionableConduct all of the questionable research experiments.Locked
Futile ResistanceKill 10 Enemies with Snarks.Locked
Gray Matter PropulsionHeadshot 20 Enemies with the .357 Magnum.Locked
Hyper Saturation ConundrumDrown in Lambda Core's coolant.Locked
Inflammatory ActionsKill a Headcrab using fire.Locked
Kinetic RepulsionKill a Marine with their own Grenade.Locked
Mega HertzKill 5 Enemies with one Grenade.Locked
Nuclear Fishin'Kill an Ichthyosaur with either the Tau or Gluon.Locked
Permeable InfrastructureUse the alternate path in Office Complex.Locked
Premature ExpulsionUse an entire clip of Gluon ammo in one continuous shot.Locked
Prophylactic SuggestedGet overtaken by a Headcrab's ample anterior.Locked
Proverbial TinkererInterfere with the alarm and laptop in Anomalous Materials.Locked
Quantum CapacitanceOvercharge it anyway.Locked
Rare SpecimenSend the Hidden Hat to Xen.Locked
Remote DetonationKill a Barnacle with a Satchel.Locked
Resonance ProcrastinatorRefuse to insert the specimen into the Anti-Mass Spectrometer.Locked
Unified Coupling TheorumHelp the Barnacle and Headcrab find true love.Locked
Universal GravitationGet killed by your own Snarks.Locked
Prolific PopperKill all Protozoans in the Borderworld.Locked
PhD in PacifismDon't kill any Vortigaunts in the Borderworld.Locked
The Rarest SpecimenLocked
One Step AheadKill 10 Enemies with Tripmines.Locked
Stealth TechnologyEscape the Hangar in Surface Tension without alerting the Soldiers.Locked
xen whenLocked
Our Brains And Your BrawnAssemble all the possible Scientists and Guards at the end of Office Complex.Locked
Less Than Desirable ConsequencesDie in the AMS Beam before starting the experiment.Locked
Orbital TrajectorySkip the opening Xen island with a secret jump.Locked
Following the RulesLocked
Doctor’s SignatureDeliver the finishing blow to Gonarch with your Crowbar.Locked
Gonad GliderGet whacked into oblivion in the ledge fight.Locked
Post-Mortem IntervalFind each member of the missing research teams.Locked
The PlanLocked
Unquestionably EthicalLocked
Contest PropellantLocked
Laser ImmunizationComplete Interloper without taking any laser damage.Locked
Black Mesa Decathlon WinnerEscape the Gargantua’s Lair without taking any damage from Gargantuas.Locked
Anti-Matter Over MindKill a Controller without killing any of its mind-controlled Vortigaunt slaves.Locked
Specimen GGTake out all three Healing Crystals in Nihilanth’s Chamber at the same time.Locked
Late for WorkDefeat Nihilanth in under 4 minutes.Locked
Limitless PotentialAccept G-Man’s offer of employment.Locked
Rather an AnticlimaxDecline G-Man’s offer of employment.Locked
Pepperoni PrecipitationLocked
Well-DoneCook a Grenade for too long.LockedKiiLime Network
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