This is just a pro-tip, if you’re like me and the cheevo did not pop after you finished all levels with three stars: you possibly missed an in-game trophy, called ‘Scout – for finding hidden animals’. You can check this in your trophy case from the menu. If this is the case, you simply need to click on one of the hidden animals, which are spread across the maps of the game. Though it was a headache for me, it could have happened accidentally to you and then you have a 100% completion by the end of the last level.
A quick win can be on level 2, where a chicken can be found next to a scarecrow in the middle of the map, next to the lake. Simply click on the chicken and in-game trophy pops up along with the final achievement of the game. Congratulations!
Please see my video for further clarity: