ODST Achievements on MCC not unlocking

Hello SLlPPERYYY,my name is Marvina, I will be happy to help you.

This is a known issue that has affected some Halo: The Master Chief Collection players. ODST campaign achievements do not unlock correctly for some players, even if they complete the campaign in heroic mode.

Microsoft is investigating the issue and has not provided a specific solution. However, there are some things you can try to fix the problem:

Restart your console. Sometimes a simple restart can fix the problem.

Update your console. If there are updates available for your console, install them. Firmware updates may include bug fixes that may help resolve the issue.

Check for known issues. Visit the Microsoft support website to see if there are any known issues with Halo: The Master Chief Collection. If there is a known issue, Microsoft can provide a solution.

If you've tried all of these solutions and are still having problems, you can contact Microsoft Support for help.

From your description, it sounds like you've tried all the steps above. In this case, you may need to wait for Microsoft to release a fix for this issue.

In the meantime, you can try replaying the ODST campaign in heroic mode. This may fix the problem. If you replay the campaign, make sure you complete all missions from start to finish without dying.

You can also try to complete the individual missions of the ODST campaign in heroic mode. If you complete all individual missions, campaign achievements may be unlocked.

Source:https://www.logrosxbox.com/guia/logro/halo-the-master-chief-collection/seguro-no-garantizada/71113

Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it

These are basic solutions to these problems, but they can lead to a solution, remember that this is a public forum where we are players like you who want to help, good luck and happy day.

Sincerely,
Marvina.

This post is old but yes there was. People received it by completing the vidmaster achievements for both Halo 3 and Halo 3:ODST. I do have the flames though in the MCC. I think they are available to the people that already had it unlocked and are not available
anymore.

Thats great loved ODST only problem i had with MCC was with achievements taking forever to unlock i didnt play MP so cant comment on that hats off to microsoft for owning up 2 it an trying 2 make up 4 it

Hi Brimm,

Thank you for posting on the Xbox forums.

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 achievements
are unlocked by difficulty. 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. I looked at the list of achievements and did not see a specific set
for 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.

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 suggest removing your account from the Xbox,

power cycle the console, and then re-add the profile after the power cycle. 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
achievements.

Let us know if they are still unlocked.

It might have something to do with the syncing of the achievement. This has happened to me in other games and then after so long after I go back to the game they just randomly unlock. One of the achievements was in Destiny 1 for mastering the Titan subclass
or something like it. I think it took about 9 months for it to unlock for me, even though I had mastered the class around the time the second dlc came out.