anyone having trouble with the blocks achievements go here-
http://www.xbox360achievements.org/forum/showthread.php?t=71948
you can get the achievement by yourself doing it this way. what they do in the video, is they play a match with two controllers, one on each team. create a 7'6 guy and put him at point guard. the account you want the achievements on go on the team with the 7'6 guy. put the other controller on the opposing team. when playing don't control your 7'6 point guard, use controller 2 and bring the point guard up to the three point line and shoot. the 7'6 guy blocks it about every time. now once you got 18 blocks, take the battery pack out of controller 2 and wait a second and then go to rematch and then you should have the 18 blocks achievement according to this video.
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(¸.•´ (¸.• Bourne