Complete Spaceport
Complete Overlord on Let's Rock difficulty
Collect all weapons
Complete Electric Station
Have 200 health
Complete Lunar Space
Have 100 armor and 200 health at the same time
Complete Occupied Territory
Complete Mortal Prison
Complete Fatal Wind
Complete Secret Laser
Complete The Incubator
Complete Overlord on Come Get Some difficulty
Complete Overlord on Piece of Cake difficulty
Complete Spaceport using only the pistol [no switching allowed]
Complete any level with 20 or less health remaining
Complete The Incubator with run mode turned on