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.
Beyond all flowers lies another room.
Completely awaken the city.
Journey to the city unscathed.
Release all of the names to the sky.
Play with the windmills and ride the wind seven times.
Life could be simple...
Light a darkened pool.
The dream has just started...
Use the grass as your canvas and paint the ground with three different colors.
Reminisce for three minutes before returning to the room.
Take a ten minute break between any dreams.
Play the game after a week long break.
Find and bloom a secret flower.