Here is the full list of all 14 Flowa achievements.
Have 777 total flowers collected across all levels
Scare off a baker's dozen of fish
Complete all 100 levels
Achieve the bonus goal on 99 levels
Finish the "final" level
Get your head in the clouds
Complete fifty levels
Achieve the bonus goal on fifty levels
Have 100 total flowers collected across all levels
Blow the car up by launching it into something
Unlock a bonus level
Get stuck in a loop
Achieve the bonus goal on ten levels
Complete your first level