Set up a game with a good team (like Florida) against a bad team (like Hartford), but crank all the shooting sliders for both teams down to zero. This will increase the likelihood of rebounds rather than baskets. Set the length of the halves for as long as you think you need (I did it with 12 minute halves).
When you get the ball, wait for your target player (the one who's gathering all your rebounds) to get near the hoop and take a quick shot from outside the three-point line. Switch to your target player and jump up for the rebound. When you get the ball, dish it back to somebody outside the three-point line and try again. You can often get 5 or more rebounds in a row before the CPU manages to sneak one away from you.
Continue this method until your target player reaches 51 rebounds and the Achievement will unlock at the end of the game.