If you have 360 and ps3 do achievements make you choose the 360 version?

[brainteeth]

does anybody know why i cant play capcom vs snk 2 on my 360 but I can play guilty gear x .....kind of odd isnt it also I used to have a ps2 controller adapter for my cube and xbox does anybody know if they make an adapter for the 360? For some reason i cant learn to play with the 360 controller as well as the ps especially for fighting games