Here is the full list of all 11 Tiny Bridge: Ratventure achievements.
Earn three stars on all levels on second world.
Collect all small cheeses and get to the big cheese in 8th level on the 1st world without any build move.
Earn three stars on all levels on first world.
Complete the first level and earn 3 stars.
Earn three stars on all levels on third world.
Earn three stars on all levels on fourth world.
Earn three stars on all levels on fifth world.
Earn three stars on all levels on sixth world.
Complete the game.
Earn three stars on all levels.
Earn 108 stars at all.