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