Here is the full list of all 11 Zipple World 2: The Sweet Chaos achievements.
You have passed the level 1
You unlocked the rock world
You unlocked the third world
You killed 10 enemies
You killed 50 enemies
You killed 100 enemies
You killed 500 enemies
You saved 10 frogs
You saved 50 frogs
You saved 100 frogs
You saved 500 frogs