Before attempting this you must first obtain the Team SSX achievement. This will give you access to all nine members of the SSX team.
Once done you have to earn bronze in a Trick It! event with each character. You do not have to do this on the same track. However, Curnoe's Moustache in the Rockies is recommended as it has a low Bronze score, making your life a little easier. Gold and Silver scores also count towards this achievement.
Note: Griff and Eddie are not part of Team SSX.
Note: Has to be in Explore Mode.