Get whacked into oblivion in the ledge fight.
Kill an Ichthyosaur with either the Tau or Gluon.
Skip the opening Xen island with a secret jump.
Drown in Lambda Core's coolant.
Use an entire clip of Gluon ammo in one continuous shot.
Escape the Hangar in Surface Tension without alerting the Soldiers.
Kill 20 Enemies with the Hivehand.
Kill 10 Enemies with Snarks.
Conduct all of the questionable research experiments.
Overcharge it anyway.
Get killed by your own Snarks.
Kill an Assassin with the .357 Magnum.
Headshot 20 Enemies with the .357 Magnum.
Kill 10 Enemies with Tripmines.
Kill a Barnacle with a Satchel.
Help the Barnacle and Headcrab find true love.
Kill 10 airborne Headcrabs using the Shotgun.
Kill a Marine with their own Grenade.
Kill 10 enemies with a reprogrammed Sentry.
Assemble all the possible Scientists and Guards at the end of Office Complex.
Use the alternate path in Office Complex.
Cook a Grenade for too long.
Kill 5 Enemies with one Grenade.
Kill a Headcrab using fire.
Get overtaken by a Headcrab's ample anterior.
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Die in the AMS Beam before starting the experiment.
Pass the toilet paper to the Scientist in need.
Perform surgical caffeine extraction from 20 vending machines.
Ruin the microwave casserole.
Interfere with the alarm and laptop in Anomalous Materials.
Unlock all ability upgrades.
Reach the Mountain Shrine.
Find all of the Rot.
Meditate at all Meditation Spots.
Destroy 3 enemies with a single dash attack.
Open all Cursed Chests.
Deliver all Spirit Mail.
Restore all of the Flower Shrines.
Collect 50 Rot Hats.
Destroy 3 enemies with a single Parry.
Destroy an enemy by shooting a Bomb out of the air.
Hit 3 Enemies with a single Rot Infused Arrow.
