Here is the full list of all 14 Flower achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Beyond all flowers lies another room.
Light a darkened pool.
Life could be simple...
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.
Bloom 10,000 flowers.
Completely awaken the city.
Use the grass as your canvas and paint the ground with three different colors.
Play with the windmills and ride the wind seven times.
Journey to the city unscathed.
Release all of the names to the sky.
Play the game after a week long break.