Hi.
Today i’ve finished Halo 5 Guardians campain mode solo on legendary difficulty with scavenging all skulls . I got already all 13 skulls and finished all 15 missions but in my achievements (Gravelord) it shows me that unlocked only 84%. Lonely Wolf, Heroes Rise and Forging a Legend are only 86 %. I have no idea what’s going on. I was going to complete whole game and unlock every achievement (1250/1250) because this game is really worth it.
It sounds like you lost connection during one of the missions. You must be connected to the game servers for the achievements to update and count. Unfortunately there is no simple way to figure out which mission(s) you need to redo.
I wasn’t sure but thought that i must repeat whole game. No worries, that will be good training between Mythical WarZone sessions and of course i’ll try to collect all intels. But i wonder how can collect all skulls and Gravelord achievement if i already unlocked them all?
By the way - that issue was probably Synchro Profile Error.