Achievement list got leaked with an achievement giving the option of either playing the campaign twice with no previous saves or once with a ME2 save imported. Highest point value is 75 for beating the game on Insanity.
http://www.screwattack.com/news/mass...r-immeasurable
Also for the Xbox 360 version is the ability to get free avatar stuff and early demo access by downloading the Mass Effect 3 Mission Command App from Facebook. The stuff has some requirements such as a free Normandy avatar prop to everyone if enough people sign up and then extra gifts based on achieving certain requirements with free DLC being given away as a possible gift.
http://www.egmnow.com/articles/news/...y-demo-access/