Well, I've gone through all normal survival challenges! halfway through hard survival as well. :) Almost gone through all of time trial as well. and partly through hard time trial. For, hard survival challenge 1 I ranked in around 1200 out of everyone. But for survival challenge 2 I ranked in at 406 out of everyone on xbox live! ;D I Dunno how in the heck i'll be able to go through all those combo challenges for each character....

Update, I completed all normal time trials now too, and got two other achieves for all personal actions and all colors being obtained. :)