There are 4 main ways to get this achievement. Take whichever you like, but I'll put them in order of which ones are the hardest to the easiest. Also, you can mix and match for your best strategy. For all of these strategies, though, make sure that the quarter length are 12 minutes and make sure the difficulty is set to "Rookie".
1) Do this achievement legitimately. **Note: This will take forever.**
2) Create a character who is 7'4" and put him on which ever team that you're going to be playing. He should be able to rebound almost every shot that the opponent's team tries for.
3) Make sure that the team that you're playing has terrible Free Throw accuracy (modify it yourself if you have to). Also, make sure that the foul frequency is turned up that that you can foul your opponent every chance that you can get and that the fouls til ejection is set to 0 so that no players can be fouled out. Every time that there is a defensive foul against the computer, they'll be able to Free Throw but they should miss the last shot every time. Your players should be able to rebound after that. Just keep fouling, and you'll get it.
4) You'll need at least one wireless controller for this one. There's a glitch in the game that you can exploit. Start a 2-player game (one user on each team) with the profile of the person trying to get this achievement being the rebounder [now being called "P1"] and the other controller being the shooting team [now being called "P2"]. Whenever P1 has the ball, make sure that P2 steals it away and shoots in the worst possible position. Whenever P2 has the ball, make sure that P2 takes shots very often.
Here's the most important part of the glitch in the game. Make sure that P1's team has one of their players with 56 rebounds (you should have the 30 team rebounds for "Defensive Rebounds galore" by this point). When you're sure that there's enough, remove the battery from the controller of P2. The team selection screen should pop up with only P1's controller lit up and on their selected team while P2 is now dulled and in the middle. Press "A" to continue. There will be a note that says "Warning: Switching now will cause you to lose any progress you've made towards an achievement so far. Continue?" Just ignore it and continue. Pause again and go to "Quit Game" and "Rematch". When the tip-off starts, the achievement will unlock.
I know that you might be thinking "Android, it says in a solo game vs. the CPU, that can't possibly work. You're retarded!" But that's how I got the achievement and that's how I suggest you get it, otherwise this achievement will eat up your days trying to get it. If it doesn't unlock at the tip-off, just try again. I PROMISE that this works although I can't tell you why it works.