Beat every "Special features" level
Ride a dragon across the sea
Defeat the Akler
Defeat Twight
Kill the same zombie over and over 7 times in The Standing Zombies
Defeat Pavos
Slay over 100 turkeys
Beat the drugged level in Going mad
Defeat Salamandra
Completelly destroy a certain vehicle
Defeat Yubi
Defeat KingPink
Defeat the Evil Queen
Defeat the Evil Queen's Black Knight 20 times in a single game
Defeat the Undead King
Reach the top of a certain wall
Defeat the Demodoctor
Grab every single blueprint
Defeat Doctor Banner
Finish Peculiar Stuff's "The School" level
Grab every single coin