You can earn this by getting 30 of 30 Pro stars if you do not have the DLC installed. Otherwise, 36 Pro stars must be collected, which is significantly more difficult. To get a Pro star, complete all the other stars requirements of a level in the same attempt. Once you get all the stars in the same playthrough, you will earn a Pro medal/star. Not all levels have a Pro star, and you can skip levels without one. To get 30 Pro stars, you must complete the main campaign (Movie mode), as well as the "deleted scenes".