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