Ok, so me and two of my friends completed the campaign on Legendary last night and none of us received the 8th mission completion achievement, or any of the campaign completion achievements. Our service records say we have finished the campaign on Legendary, but the mission selection for the 8th one says that we haven’t even started that mission. What do I do?
maybe it will help to do the 6th mission again. i know, it a pain in the -Yoink-, but i thin this will be the only solution.
i had a problem alike this one in sparten ops. i finished the 4th mission, the women told something, it stock a little and then i was in the ponts menu but dident get the cheevo and it was not regestred as playd. i did it again and it worked.
may it help u a bit.
try redoing the 8th, i just lost all my campaign data 