Halo 3 ODST achievements in MCC not unlocking

Brimm · Jul 18, 2019

Hello. On a whim recently I decided to complete the campaigns for the various Halos on the Master chief Collection. I had partially completed all of them but had a few uncompleted chapters on each. I just finished up the two chapters I had not yet completed
on Halo 3 ODST. 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. It clearly shows me as having completed 11 of 11 missions on the main menu but according to the achievement
lists I am still at 75% on all of the achievements for finishing the game.

The only peculiarity is that I finished those last two levels SOLO while the rest of the game I did in CO-OP. 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.
Didn't matter solo/co-op in that game.

Again, 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. No achievements. Anyone encounter this error?

:)

MaximumExtreme

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.

NxtDoc1851

For the Master Chief Collection

m.ign.com/.../halo-3-odst-mcc-release-date-revealed

ODST will be added in a few days

Nursemorph

Halo 3 ODST is an add-on for the MCC so it needs the MCC installed as well. Have just checked the Store and ODST can't be bought separately so it must be the MCC add-on:

https://www.xbox.com/en-GB/games/store/halo-3-odst/9N007VX9RGXZ/0010

As you will see on that page:

"This content requires a game (sold separately)."

Game meaning MCC

XBF Diego M

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.

AWildYamiEnters

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.

Halo 3 ODST achievements in MCC not unlocking