Zumba Fitness World Party

Under the 'My Zumba' section on the main menu, you'll find the option to set goals for yourself. To unlock this achievement, you'll first need to set a goal. It can be as short and simple as you'd like: play for an hour, burn 100 calories, etc. Then, you simply need to complete that goal, which could be as quick as a few songs.

Note: I recommend setting a goal for 12 hours of playtime in one month. The reason for this is because there is an achievement for playing for 12 hours in one month, and there is no way to track your progress for it. Setting a goal with the same requirement allows you to see your progress towards that achievement, and completing it will unlock this achievement as well.