Here is the full list of all 14 Flower achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Bloom 10,000 flowers.
Light a darkened pool.
Take a ten minute break between any dreams.
Completely awaken the city.
Play with the windmills and ride the wind seven times.
Journey to the city unscathed.
Release all of the names to the sky.
Beyond all flowers lies another room.
Use the grass as your canvas and paint the ground with three different colors.
The dream has just started...
Play the game after a week long break.
Reminisce for three minutes before returning to the room.
Life could be simple...
Find and bloom a secret flower.