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