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.
Beyond all flowers lies another room.
Release all of the names to the sky.
Play with the windmills and ride the wind seven times.
Use the grass as your canvas and paint the ground with three different colors.
Completely awaken the city.
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.
Play the game after a week long break.
Find and bloom a secret flower.