To earn a Quadruple Double you will have to earn 10 or more points in FOUR of the following categories:
The easiest four would be points, rebounds, assists, and steals. You should be able to earn 10 points easily within a couple minutes. The easiest way to earn assists and steals is to set up a second controller. After you score a basket, the opponent will have to inbound the ball. Once they have done so, walk up with one of your players and hold X (make sure the animation is finished before attempting another steal) this will make your player steal the ball. It can be tricky the first few times you do it. If you get too close the person with the ball will go into a defense stance. If he does this, back away until he is in a normal position and try it again. Once you have stolen the ball just pass it to a teammate and have him score. Repeat this process until you have 10 assists and steals. The easiest way to get rebounds is when the other team in bounds the ball. As soon as it is in bounded shoot using B or X with your second controller. It will most likely nail off the backboard or miss completely. Just use one of your players to retrieve the ball. Repeat 10 times and you are golden
This achievement is not as hard as it may seem. If you are having any troubles feel free to MSG me.