I've been playing offline for the last few weeks due to moving house and not having a net connection.
My 360 hard drive failed and lost my gamertag. I was able to recover a few savegames including halo but that's about it..
Today, i went to a friends place and re-downloaded my gamertag which took my halo achivements back about 3 weeks.
Not sure what to do now as i've got all the skulls, but the achivement hasnt unlocked. I tried to search around for a skull but because they're all unlocked - they've disappeared from the levels.
Any ideas or advice? Or does this mean I have to delete my halo savegame and start from scratch :(
edit: i should add that i got a few achievements for Limbo while i was offline. as soon as i loaded the game, the achivements i got a week back unlocked automatically. why won't halo do the same!!?