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.
Bloom 10,000 flowers.
Journey to the city unscathed.
Completely awaken the city.
Reminisce for three minutes before returning to the room.
Take a ten minute break between any dreams.
Light a darkened pool.
Play with the windmills and ride the wind seven times.
Life could be simple...
Use the grass as your canvas and paint the ground with three different colors.
Release all of the names to the sky.
The dream has just started...
Find and bloom a secret flower.
Play the game after a week long break.