Here is the full list of all 16 Cats are Liquid achievements.
Complete the game.
Complete World 8.
Complete World 7.
Complete World 6.
Complete World 5.
Complete World 4.
Complete World 3.
Complete World 2.
Complete World 1.
Always watching, always there. You can't escape.
Complete the entire game without destroying any moving enemies, in a single run.
Complete the entire game without taking any damage, in a single run.
Complete Companion World 1.
Complete Companion World 2.
Complete Companion World 3.
Complete the Reset level pack.