You will need to get 45 rebounds total with your team for this achievement. Both offensive rebounds and defensive rebounds count towards the 45 rebounds needed for the achievement. This achievement will be easier if you move your rebound sliders to 100 and your opponent’s rebound sliders to 0.
If you have a second controller, there is a method that you can use to get enough rebounds in only a matter of minutes. After the opponent gets the ball, leave them on your side of the basketball court and use your second controller to have the player holding the ball shoot the ball all the way to the other side of the court. One of your players should catch the ball automatically without you having to control them. Repeat this until you have enough rebounds for the achievement to unlock.