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