Complete stage 1 in story mode

Complete stage 2 in story mode

Complete stage 3 in story mode

Complete stage 4 in story mode

Complete stage 5 in story mode

Complete stage 6 in story mode

Complete arcade mode

Survive through 5 waves in survival mode

Unlock the MK 1000

Unlock the turrets

Unlock all the characters

Upgrade at least 4 characters to max level

Burn 100 enemies during the same run

Electrify 30 enemies during the same run

Complete stage 4 in story mode without using any special item

Die in any mode

Get at least one of each collectible item