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