Accomplishments! Jun 17, 2011 19:03:01 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by shardelay on Jun 17, 2011 19:03:01 GMT arstechnica.com/gaming/news/2011/06/achievement-unlocked-how-developers-can-predict-behavior-patterns-through-rewardshow-game-developers-can-predict-behavior-patterns-through-rewards.ars