You’ll unlock this mini-game after completing Chapter 6. Getting 10,000 points is not terribly difficult, though it may take you a few tries. You get points for passing each checkpoint, so it isn’t necessary to collect every star to get the achievement. Play it safe, particularly as the course speeds up, and you shouldn’t have too many problems getting this achievement. As with the boat course, don’t risk your balloon going for tricky little stars, since they are only worth 10 points, and the large stars are worth 50, compared with 250 for a checkpoint and 500 for a red star.