Accomplish everything.
Purchase all of the drones from Patchie's Shop.
Complete the main story campaign.
Defeat the boss: Memory Thief
Destroy 500 enemies.
Defeat the boss: Mecinni
Meet the character: Professor
Defeat the boss: Mutant Landian
Loot 1000 cogs from enemies and pickups.
Defeat the boss: Golem
Gather 100 health pickups.
Defeat the Boss of the Landians.