This occurs in the Just Dance Machine game mode. In this game mode, you need to help aliens power their spaceship through the power of dance! Your dance instructor will be abducted from some weird scenario which may or may not be actual dancing. For example some of my dance instructors were a chef chopping vegetables, a maestro conducting a performance, a guy swimming, and even a performer literally just bowing like 6 or 7 times in a row.
Instead of the usual Just Dance scoring system (X, Okay, Good, Perfect), you will be judged on a pass/fail system where X and Okay are fails and Good and Perfect are passes. Each round has five different instructors. Each routine can fill a maximum of 3% Ship Energy, so each round has the potential for 15% ship energy, and each round takes around 2-3 minutes. This means you'll need to do at least 7 rounds if you want to get to 100%, but you'll likely need to do more because you won't be passing every move. Overall this achievement is not too hard and you can knock it out in around 30-45 minutes.