I believe i've pitched this idea already but win X matches with clan Y and clan Z should be there,plus i'd like to see stuff like win X matches without taking more than 5 or 6 damage.
Oh,and to bring back the true spirit of what urban rivals was originally(i think the game has strayed a bit from it being urban,and now it's just like a stephen king novel),there should be win with clan x against clan y,so you have,for starters
-Win 25 matches with the Montana against a hand with 2 or more Pussycats
-Win 50 matches with the Huracan against a hand with 2 or more All Stars(they actually do hate each other despite what one new blood story says about them providing security at the All Stars stadium would have you believe)
And for the record,general missions are added yearly,on NB friday,legendary friday,and one mission is added depending on the clan that has it's legendary re-released.