Destroy 50 enemies without taking damage.
Change the language settings.
Complete 10 consecutive levels on Headliner difficulty without dying.
Complete Synergy on Headliner.
Complete Leviathan on Headliner.
Kill 50 Anglers in Leviathan.
Get max multiplier 10 times in a single playthrough.
Hold a max multiplier for 2 minutes.
Complete Choose Your Weapon on Headliner.
Unlock all 10 levels.
Die a horrible death 1000 times.
Earn Diamond for all 10 levels.
Earn Gold for all 10 levels.
Earn Platinum for all 10 levels.
Complete MTRD on Headliner.
Kill 50 enemies with only 1 health remaining.
Complete Distorted on Headliner.
Complete Eclipse on Headliner.
Upgrade all weapons to Max for every level.
Complete a full song.
Complete Synergy 50 times on Headliner.
Complete 500 objectives.
Complete Urban Metaphor on Headliner.
Don't move for 1 minute.
Complete Metalworks on Headliner.
Collect 9000 wubs for any level.
Complete all levels on Headliner difficulty.
Complete Tough Guy on Headliner.
Play a level 25 times in a row.
Stay on the artist loading screen for 1 minute.
Complete a level without taking any damage.
Complete Break It Up on Headliner.
Activate 2x multiplier 100 times.
Upgrade All Weapons For Single Level.
Collect over 1000 Wubs in a single play through.
Pass the toilet paper to the scientist in need.
Perform surgical caffeine extraction from 20 machines.
Kill 10 Airborne Headcrabs using the Shotgun.
Kill 20 enemies with the Hivehand.
Ruin the microwave casserole.
Kill an Assassin with the .357 Magnum.
Kill 10 enemies with a reprogrammed Sentry.
Conduct all of the questionable research experiments.
Kill 10 enemies with Snarks.
Headshot 20 enemies with the .357 magnum.
Drown in Lambda Core's coolant.
Kill a Headcrab using fire.
Kill a Marine with their own grenade.
Kill 5 enemies with one grenade.
Kill an Icthyosaur with either the Tau or Gluon.
Use the alternate path in Office Complex.
Use an entire clip of Gluon ammo in one continuous shot.
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.
Kill a Barnacle with a Satchel.
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Help the Barnacle and Headcrab find true love.
Get killed by your own Snarks.
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