NBA 2K11 will feature 50 achievements, only one of them concerns a feat with a specific player in a standard game. It just so happens to involve the cover athlete for rival NBA Elite 11.
"G Performance," a cheevo that's an apparent nod to in-game sponsor Gatorade, gives you 20 Gamerscore if you score 48 points with Oklahoma City's Kevin Durant. Why that guy? He's the cover rep for NBA Elite 11. Why that figure? Because his real-life career high is 47.