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