Accept G-Man’s offer of employment.
Decline G-Man’s offer of employment.
Use an entire clip of Gluon ammo in one continuous shot.
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Kill 5 Enemies with one Grenade.
Kill 20 Enemies with the Hivehand.
Kill a Barnacle with a Satchel.
Headshot 20 Enemies with the .357 Magnum.
Kill an Assassin with the .357 Magnum.
Pass the toilet paper to the Scientist in need.
Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Complete Interloper without taking any laser damage.
Escape the Hangar in Surface Tension without alerting the Soldiers.
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time.
Defeat Nihilanth in under 4 minutes.
Find each member of the missing research teams.
Get whacked into oblivion in the ledge fight.
Deliver the finishing blow to Gonarch with your Crowbar.
Skip the opening Xen island with a secret jump.
Die in the AMS Beam before starting the experiment.
Assemble all the possible Scientists and Guards at the end of Office Complex.
Kill all Protozoans in the Borderworld.
Kill 10 Enemies with Tripmines.
Kill an Ichthyosaur with either the Tau or Gluon.
Kill 10 airborne Headcrabs using the Shotgun.
Ruin the microwave casserole.
Kill 10 enemies with a reprogrammed Sentry.
Conduct all of the questionable research experiments.
Kill 10 Enemies with Snarks.
Drown in Lambda Core's coolant.
Kill a Headcrab using fire.
Kill a Marine with their own Grenade.
Use the alternate path in Office Complex.
Get overtaken by a Headcrab's ample anterior.
Interfere with the alarm and laptop in Anomalous Materials.
Overcharge it anyway.
Send the Hidden Hat to Xen.
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Help the Barnacle and Headcrab find true love.
Get killed by your own Snarks.
Perform surgical caffeine extraction from 20 vending machines.
Don't kill any Vortigaunts in the Borderworld.
Cook a Grenade for too long.
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