According to a tweet from the official Twitter feed for Xbox Live Rewards, future achievement points earned by Xbox 360 players will reward players with MS Point rewards. According to the tweet, Microsoft will begin rewarding players for unlocking achievements with MS Points:
"We've hit 50,000 followers, which means it's time for an announcement! Coming Fall: a new way to earn Rewards based on your Achievements!"
Further details on how this new rewards program will work were not revealed. Achievement junkies who don't mind spending the extra time unlocking even the most obscure in-game accolades will surely rejoice at this news.