NBA 2K7

easiest way to do these player achievements is with 2 controllers (NOTE: you must use 2 controllers from the beginning of the match and not change sides half way through a match or it nullifies the achievements you have obtained during that particular game)

pick the team which the player is on and half length you think is long enough to achieve the achievement criteria - i used 3 min halfs though some may need longer or less time.

for Yao you need 30 pts, 15 rebounds (off or def) and 5 blks (Yao is on the Houston Rockets) for rebounds turn out of bounds off then run directly behind your own basket and take a shot, it should bounce off your own backboard and just catch it (doesn't matter if it bounces) - 1 rebound down quick and easy then just repeat for however many you need.
Blocks - have the second controller team shoot from their own half just stand in front of the player with the ball by about a foot and press the shoot and block (Y) at the same time on both controllers - i had a succes rate of about 85% with this method and worked best for me.

These player achievements are VERY annoying. To get his you just need to have him on the team and have him get 30 or more pts, 15 or more rebs, and 5 or more blks. I used the All-Star teams when going for these achievements because there are numerous players you can get done at the same time. Set the game to rookie and move the sliders in your favor and move the CPUs to make them even worse. I used player lock and let the computer control Yao.