NBA JAM

I attempted a few combinations of players and options for this achievement, but Howard/Shaq [ORL] seemed fine. You should be able to get this achievement by scoring only alley-oops in a 2v2 (though board-breaks appear to be mostly luck) but I used the following:

3 controllers: P1-CPU vs. P2-P3
Options: 2 minutes, 0 shot-clock, Easy (in hindsight, a longer quarter would've been better, but I'm not sure if that affects the chance of the board breaking)
Players: Howard-Shaq [ORL] (high strength and dunk ratings)
Opponent: Anyone 2 players with weak strength control stats; I used the Clippers

I achieved this by attempting as many alley oops as possible. Make sure when trying to get on the offence, push from behind as it has a higher chance to make the opponent fumble. Standing inside the top of the key also encourages your CPU team mate to go for the alley-oop, if you need to build up dunks. Also be sure when passing to yourself for the alley-oop, don't continue holding the A button as you'll pass before you score. The board broke when scoring the 86th point with the following stats:

Howard (1P): 7 dunks-17 alley oops
Shaq (CPU): 8 dunks-3 alley oops

It seems to come down to chance when the board breaks as I had several matches just dunking until 50-75 points, then alley-ooping to 90 odd points and not having the board break, but you should be able to get it in a few attempts if you haven't already got it while playing normally.

NOTE: You have to be the one to make the board-breaking dunk, not your team-mate.

There are three things to keep in mind while going for this achievement:

1. Be ahead in the score. It won't unlock otherwise.
2. Have at least 50 points. This seems to be the magic number in the score.
3. It has to be the 4th quarter. Won't happen earlier whatsoever, It takes time to weaken the rim and backboard.

Dunk and alley oop the entire game, you won't see it but it will cause damage. 4th quarter always alley oop. If you can get your player on fire, it will help significantly. It has to be you to break the board, not your teammate.

I did this with Andrea Bargnani of the Toronto Raptors, with DeMar DeRozan as my teammate against the Milwaukee Bucks. It unlocked for me when I did an alley oop to make the score 60-32 in the game.

NOTE: I have seen the AI get this in 3rd and with under 50 points, but have never seen another player/human do this in less. If I do, I will change it.