Aluminum Cell - Finish the Cell stage on Hard difficulty.
Cell Addict - Finish the Cell stage 25 times.
Completist - Unlock all the parts in Cell stage.
Creature Stage Unlocked - Play enough of the Cell stage to unlock the Creature stage.
Landfall - Finish the Cell stage and clamber onto the planet's surface!
Pacifist - Finish the Cell stage without killing another creature.
Speedfreak - Finish the Cell stage in under 8 minutes.