Zumba Fitness

Just make sure that you do classes and not single routines and this achievement will come very fast. The fastest you could go this achievement is in 1 hr and 40 minutes by completing 20 minute classes. You'll must likely get this achievement while you are completing all the classes for other achievements. Very easy to do in one day. If you don't feel like dancing, you can always set your Kinect so that you can sit/lay down while it runs. This way you can do something else while you wait for it to finish. You can not fail in this game and your score does not matter.