So I went through the campaign on easy getting collectibles and finishing all objectives, but apprentice I’m missing one? On the second mission, it says there’s 8? Can someone tell me what this 8th subjective is, so I can complete it please?
Did you destroy the hidden base? If not it’s at the bottom right corner of the map and you can only reach it with hornets.
I have this problem too, the game says i have them all but Waypoint says i have 6/7 even though i’ve done them.
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> So I went through the campaign on easy getting collectibles and finishing all objectives, but apprentice I’m missing one? On the second mission, it says there’s 8? Can someone tell me what this 8th subjective is, so I can complete it please?
This is more than likely a Waypoint glitch. Don’t worry, you aren’t the only one to report it.
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> Did you destroy the hidden base? If not it’s at the bottom right corner of the map and you can only reach it with hornets.
Are you talking about the same mission that I am? I’m talking about the one where you first meet decimus, and you have 3 kodiaks under anders control that shoot some enemies for you?
Guys Chill. It’s a website bug, ok? They will work on it as soon as the new update gets released. ETA for update: within a week, XBOX One gets it first. 
I believe this same issue has been logged here:
https://www.halowaypoint.com/en-us/forums/8f4648981f554a9d86527a5754966e89/topics/halo-waypoint-sub-objectives-mistake/e2e2a252-c949-48bc-8c48-bbd8bd7b4057/posts
If that is a different issue OP, let me know and I can re-open and move to support