Here is the full list of all 43 Fluffy Friends achievements.
Complete level 21
Complete level 20
Complete level 19
Complete level 18
Complete level 17
Complete level 16
Complete the first 16 levels
Complete level 15
Complete level 14
Other monster falls into the abyss
Complete level 13
Complete level 12
Complete level 11
Don't use buttons to complete the level
Complete level 10
Complete level 9
Complete the first 8 levels
Complete level 8
Complete level 7
Fall into the abyss
Complete level 6
Complete level 5
Complete level 4
Meet Mad Orange monster
Meet Purple Rustling monster
Complete level 3
Complete level 2
Meet Blue Cavething monster
Complete level 1
Meet Green Horn monster
Complete level 22
Complete level 23
Complete level 24
Complete level 25
Complete level 26
Complete level 27
Complete level 28
Complete level 29
Complete level 30
Complete level 31
Complete level 32
Complete the first 24 levels
Complete all levels