Here is the full list of all 45 Zoo Rampage achievements.
Run over 5000 visitor
Run over 2500 zookeeper
Run over 2500 visitors
Destroy 10 balloon stands
Eat 500 fish
Eat 250 fish
Shoot 50 goals
Run over 500 visitors
Run over 250 zookeeper
Play as a snow tiger
Destroy 10 hot dog stands
Play as a reindeer
Play as a polar bear
Play as a phyton
Destroy 15 toilets
Finish all levels
Finish the "Free Fish" level
Start the "Free Fish" level
Finish the "Soccer Match" level
Shoot 25 goals
Start the "Soccer Match" level
Finish the "No Escape" level
Play as a tiger
Start the "No Escape" level
Play as a gorilla
Finish the "Outbreak" level
Destroy 15 trees
Start the "Outbreak" level
Play as an elephant
Finish the "Arctic" level
Start the "Arctic" level
Play as a penguin
Finish the "Jungle" level
Start the "Jungle" level
Play as a crocodile
Finish the "Africa" level
Finish any destruction level
Destroy 5 gas tanks
Play as a zebra
Play as a rhino
Run over 10 visitors
Get over 9000 points
Scare 50 visitor
Start the "Africa" level
Play as a giraffe