Zumba Fitness

Go to tutorials and play all the tutorials in "Learn the Moves". Order isn't important, but for each style they naturally develop using techniques found in previous tutorials. For each style there are three tutorials, for a total of 18 tutorials.

I found that I didn't actually need to mirror the instructor. I just wriggled and jumped around a bit and it kept itself orange/green. As soon as she says "and that's Zumba!" or similar, you can relax: Kinect stops paying attention to you and the tutor keeps dancing for a few seconds until it completes.

Earn all these achievements to unlock Zumba Starter:

There are 18 tutorials in all covering the dance types Calypso, Cumbia, Belly Dance, Reggaeton, Merengue, and Salsa. After signing in, go to Play > Tutorials > Learn The Moves. Now proceed to complete each tutorial class for each dance style to unlock this achievement. I want to add that you don't have to dance for this achievement or stand for that matter. Set up your Kinect so that it picks you up while you're sitting down and turn the input to TV, curl up with your laptop, etc. I did this for the majority of the game and it makes all the achievements go much faster. You can actually unlock achievements in this game while sitting on TA. It is pretty awesome!