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