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