Attain 5 stars on all SP levels

Complete the Final Stage in Story Mode

Complete Marathon Mode

Reach Wave 10 in Survivor Mode

Complete your first level

Reach a combo of 99 kills in any mode

Finish a stage without taking any damage

Kill 10 enemies with one sledgehammer power-up

Finish a stage without killing a single enemy

Finish a stage without ever changing lanes

Get 20 projectile kills in a single stage

Reach Stage 2-5 in Marathon Mode

Finish a stage with the crosshair off