Next day when I wanted to play solo, I noticed I had not unlocked the achievements for those two levels, but the game had marked those missions as completed, which we did, but just not from the beginning of the level. Instead of doing that, we just chose a rally point, finished the level, went on to the next one and a similar thing happened. Us off closest to where the disconnection happened, since our progress was not saved and was forcing us to start the level over. When that happened, we re-joined a lobby and had to start where we left off by choosing a rally point to start There were two levels on Halo 3 that I played online co-op with a friend and during our session, we had at least one disconnection on both levels. That is definitely very weird, however there is something I noticed about the MCC collection and the requirements to get an achievement for completing a level that I discovered from my own recent playthrough of all the campaigns, minus Best Wishes, Diego Xbox Forums Support (๑ˆ◡ˆ๑)ノ Once the profile is re-added and everything is connected to Xbox Live, open your guide and go to the Achievements tab, then "See all my achievements" and find the Halo 3 ODST completion Power cycle the console, and then re-add the profile after the power cycle. I suggest removing your account from the Xbox, This can very well be the cause of a data sync issue between your Xbox and the servers responsible for profile data and achievements. I looked at the list of achievements and did not see a specific setįor co-op completion, so it shouldn't matter how you finish the levels, just as long as you complete them, so I understand this can seem confusing. If you completed every level on Legendary, solo or co-op, then you should have unlocked all of the completion achievements for each difficulty, which should be 4. So to confirm, you completed every level on ODST on Legendary right? You didn't beat one level on Heroic maybe? That's the only reason why I would think that it would show as incomplete when you have finished all 11 levels since the completion achievementsĪre unlocked by difficulty. Thank you for posting on the Xbox forums. That being said I did the exact same thing in Halo 4 - last level finished solo, the rest in co-op - and got all the achievements for that one.Īgain, double checked and I am 11 for 11 in ODST having finished every level on legendary, though two were solo and the rest co-op. The only peculiarity is that I finished those last two levels SOLO while the rest of the game I did in CO-OP. Lists I am still at 75% on all of the achievements for finishing the game. It clearly shows me as having completed 11 of 11 missions on the main menu but according to the achievement I got the 10 point achievements for each for completing each level but did NOT get any of the achievements for having completed the game. I just finished up the two chapters I had not yet completed I had partially completed all of them but had a few uncompleted chapters on each. On a whim recently I decided to complete the campaigns for the various Halos on the Master chief Collection.