okay so ad all of you know you need to complete the challenges to get weapon upgrades and ive done that now i want to go a step further and complete the three star challenges and ive tryed doing it solo and its a pain in the ass so if there is any one out there on the xbox 360 who would like to party up and help me complete the three start challenges let me know

you can't complete the Star challenges with multiple players.
if you look at the menue while starting a multiplayer challenge, you will mention that the stars aren't shown on the top of the mission menue, as it does when you doing it solo!
so... there's no way to complete the 3 star missions with other players... you need to do it solo

i've done parkour this and be more objective on 3 stars.


Escort duty and tower defense i've only gotten to 2 because its just so difficult.

I still think we need more challenges to get exp like race the other team to another side of the map using S.M.A.R.T

try doing them with a new character, the bots will help more