Pick up 30 coins in a row on a single level without letting any disappear.

Beat the epilogue

Perform a 12x combo

Destroy 200 glass panels

Kill 99 dogs

Throw a weapon at an enemy so that his weapon hits another

Perform a 6x combo

Hit an enemy with a weapon bounced against a wall

Perform a 4x combo

Plant your first 10 peashooters

Build a Laboratory.

Gain access to the lowest level in your base.