I had a similar issue to this.THERAVINGAPE wrote:Gamertag is THERAVINGAPE, finished the halo 3 laso playlist on splitscreen yesterday with my brother, he got the achievement and I didn't (I was 2nd player). The playlist itself shows 11/11 done, but the halo 3 playlists screen says 0/8 done. Is there a fix?
GT: Melt the fishie
Achievement: Preference for Pain
Completed the Halo 3 LASO playlist, in order, in coop (coop partner was host). He got the achievement, my playlist says 10/11 and shows me having not completed the Cortana level.
Could possibly avoid replaying the whole playlist by joining someone who is at or near this level.