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