Dance Central 2

This is a relatively easy achievement which can be obtained simply by getting stars after each dance. I did this while working on four other achievements at the same time which can save you a bunch of time.

Depending on how good you are at the game and how many stars you achieve per song you should get this with a couple hours of play.

I got most of my stars by playing fitness mode and I picked the playlist that was close to 40 minutes of run time. If you play this all the way through you should obtain:

Fitness Fanatic
Endless-ish setlist
Working it out
Biggest Winner

This will also get you well on the way to "Star Quality". If you 5 star all the fitness songs (any difficulty) on the 40 minute playlist you will be at 75 stars as there are 15 songs (15X5=75). You will then only need to play a few more songs to capture the achievement (I got the rest of my stars by playing in perform it mode and achieved it before I had completed the first crew's list - on easy difficulty).

Good luck!