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