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.
Life could be simple...
Use the grass as your canvas and paint the ground with three different colors.
Beyond all flowers lies another room.
Play with the windmills and ride the wind seven times.
Light a darkened pool.
Release all of the names to the sky.
Completely awaken the city.
Journey to the city unscathed.
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.
The dream has just started...
Find and bloom a secret flower.