Several people asked in the comments below for Genre based goals. We have now made a way for you to set a Site Leaderboard Value goal which effectively accomplishes this.
For example, if you wanted to set a goal for 20,000 GamerScore in all Shooters, go to that Site Leaderboard
, track yourself in it, and then create a new Site Leaderboard Value goal with a Target of 20,000. You'll get your progress tracked towards this every day!