I've never played a game on my MacBook that will even potentially earn achievements for my gamertag, and noticed that World of Goo could be played on my Mac. The question I'm wondering is this; is there a certain version of the game I have to download in order for it to register that I am earning achievements? I didn't want to get the one from the 2Dboy's website, or the steam version, and not be able to earn achievements because I didn't get it in the right format. I have read that if you get it on Games For Windows Live, it will unlock achievements, but I can't get the games for windows live to work on my mac, seeing as it is not compatible. However, I would still like to be able to play it on my Macbook... Anyone have this same problem?