Here is the full list of all 11 Plush achievements.
Play with 200 animals simultaneously.
Play with 50 bears simultaneously.
Play with 100 cats and 1 hippo simultaneously.
Play with 50 tanks and 50 cats simultaneously.
Play with 150 animals simultaneously.
Complete level 1 in under 3 seconds.
Complete all levels on easy difficulty.
Complete all levels on normal difficulty.
Complete all levels on hard difficulty.
Make Penny laugh.
Complete level 24 on Hard difficulty.