What worked for me: 12 min quarters, all sliders in user's favor, no rules. I would manually pick Camby after each play and put him right in front of the basket. Right when the opponent shot, I would switch off of him by pushing A (I didn't care who I was switching to). By doing this, Camby wouldn't try to block since I was controlling him when the shot went up, but then the AI would get the rebound when I switched off. This worked on 80% of the plays that the computer ran. I would then huck the ball down so the opponent would get it back faster. You do need to manually get at least one rebound (the 27th or beyond) to trigger the achievement.