Buy everything
Have all armor
Get all of the golden bullets for all the levels in the campaign
Play every level in the Endless mode
Get gold trophies on all levels in the Endless mode
Survive 3 waves in the Endless mode
Beat a highscore in the Endless mode
Get a gold trophy in the Endless mode
Kill 1415 enemies with sniper rifles
Beat 30 levels in the co-op mode
Fire each gun at least once
Beat every level in the campaign
Beat the final boss
Kill 1191 enemies with pistols
Finish Act 12
Be served by a cat
Fully complete Act 12
Get 100 percent on all side levels
Beat all side levels
Finish Act 11
Fully complete Act 11
Finish Act 10
Fully complete Act 9
Fully complete Act 10
Have 5 extra lives
Finish Act 9
Finish Act 8
Fully complete Act 8
Fully complete Act 7
Finish Act 7
Buy 1 extra life
Kill 1314 enemies with shotguns
Kill 1241 enemies with explosives
Kill 732 enemies with the flamer
Fully complete Act 5
Finish Act 6
Fully complete Act 6
Finish Act 5
Kill 10000 enemies
Finish Act 4
Fully complete Act 4
Fully complete Act 3
Kill 1410 enemies with machineguns
Kill an Airship
Finish Act 3
Defeat a boss with a Forcegun
Buy a book
Kill 50 enemies with Dash
Kill 1187 enemies with energy weapons
Kill 100 frozen enemies
Kill 1097 enemies with stream weapons
Beat 30 levels in single player mode
Finish Act 2
Fully complete Act 2
Beat a level without missing a single shot
Die 10 times
Kill 13 ghosts
Spend 10000 gold
Kill 10 Parachuters before they hit the ground
Fully complete Act 1
Finish Act 1
Fire 10000 shots
Kill 5 enemies with a single explosion
Kill 3 enemies with a single shot (Dragonflies do not count)
Kill 10 enemies with a single Hammer Strike
Finish the prologue
Kill an enemy with a blast from a Bomb