Here is the full list of all 32 Deadlings: Rotten Edition achievements.
Complete all bonus levels with maximum rank.
Complete all bonus levels.
Complete bonus level 10.
Complete all levels in Nightmare Mode with maximum rank.
Complete 60 levels in Nightmare Mode.
Complete 45 levels in Nightmare Mode.
Complete 20 levels in Nightmare Mode.
Complete 5 levels in Nightmare Mode.
Complete level 14 in less than 10 seconds.
Collect 200 stars.
Complete phase 4.
Complete all levels in Normal Mode with maximum rank.
Complete level 04 using one zombie.
Kill over 100 zombies.
Discover a crazy mutators.
Collect 150 stars.
Kill the zombie with the other zombie.
Complete phase 3.
Discover a freezing freezers.
Collect 800 brains.
Discover an awesome portals!
Collect 100 stars.
Finish 20 levels without killing a single zombie.
Complete phase 2.
Collect 400 brains.
Collect 50 stars.
Discover a deadly lasers.
Unlock the Lazybrain.
Complete phase 1.
Collect 150 brains.
Unlock the Gasfat.
Unlock the Creep.