Here is the full list of all 16 HEN, CHICKS AND CATS achievements.
Find all the hen chicks.
Collect a golden egg
Play island 31
Collect a brown egg
Find 80 hen chicks
Find 40 hen chicks
Play island 16
Collect a white egg
Chick crushed by pig
Find 20 hen chicks
I think cats don't like water.
Chick captured by cat
Find 10 hen chicks
Can chickens swim?
Find 5 hen chicks