Kill 10 enemies with one sledgehammer power-up
Complete your first level
Finish a stage with the crosshair off
Attain 5 stars on all story stages
Complete the final stage and story mode
Complete Marathon mode
Reach wave 10 in Survivor Mode
Reach a combo of 99 kills in any mode
Finish a stage without taking any damage
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
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