a Double Double is when you have a two-digit number for two different stats with one player. Points and Rebounds will be the easiest, but Steals, Blocks, and Assists also count towards this.
i turned up all the sliders for the Human player, and turned them all down for the AI. i also turned the game length to the max. you can turn up the game speed as well to get through this process faster, but i forgot to. just focus on getting 10 points with each player by passing to whoever you want to score, starting with the ones that seem to be getting the most rebounds. after one quarter, three of my players had 10 points, and the other two had 8 and 2. they all had between 3 and 6 rebounds.
eventually one player will get 10 rebounds on their own, but you can try to help this along by switching to the top rebounding player (by holding LT and pressing the button assigned to them) and keeping them under the basket when the other team shoots. the achievement will pop as soon as someone hits 10 for any two stats. i got this in the 2nd quarter.