Complete the game
Rotate the screen 500 times
On 'Difficulty Increased' level, fall out of the purple gate instead of walk.
Get the best ending using the secret unlocked in 'The Jar Does Nothing!'
Get the best ending using the secret unlocked in 'Promise Kept'
Beat the game and get the normal ending.
Climb to the top of the tower
Clear a level after dying five times in it.
Stop a cop car before it makes contact with a tombstone