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