I have beat the level "Halo" for Halo:CEA on both Heroic and Legendary and the Level Complete Achievement will not unlock.
I have the "How Pedestrian" achievement that shows that I beat the level as well as the "Believe in a Hero" for beating the entire campaign.
I have seen a couple of other people with this issue, but no answer how to get it fixed. I started a ticket with XBox Support, but they said it needs to go to 343i.
I just finished the level "Pillar of Autumn" on Legendary with four skulls active and did not unlock the Tsantsa Achievement either.
How do I open a ticket with 343i?