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