Team Redlynx would like to thank you for being a forum member by giving you this sweet a$$ looking Racing Jersey. If you're not a already a member sign up at http://www.redlynx.com for this exclusive content.
Could be anything really. Dosen't have to be a shirt.
I don't think that achievements where you need to play previous games or go to forums is a good idea, because it's an achievement for the CURRENT GAME not previous, and some people don't care about a website actions. I would really hate when some "Upload a photo to ... site to get this achievement". What achievements I felt challenging in Evo was Unyielded 2, Full Throttle 2, Finishing "The Ascent" with the Rattle faultless, and Burnt in Crisp [on lab rat on flames], that I would see more in Fusion and what I disliked about are some DLC achievements like 0 faulting "Wail of the Banshee", "Hey Mom, Look at me!", "All is Gold", "Atomic number 78" and "Ultimate Endurance 2".
I agree with you blaster. My post before was something for having playstation and all the other platforms to take a part in.
Otherwise maybe gear unlocked through play time. For say 24 hours playing Fu. unlocks the shirt or other stuff like that.