After playing all last night with some friends with a system link for a 4 player co-op sesh offline because his internet was off at his house i get back home and i log in i have all the legendary achievements but i don’t have any of the progress saying that i completed story mode or any of the armor unlocked. >_< i have no idea who to talk to or report to, to ask if i can get this fixed somehow.
For your stats and progress to be tracked online, you need to be connected to LIVE as you are playing.