Missing Campaign Achievements

Gamertag: InboundLegend7
Missing Achievements: I’ll list them all below, but I beat the Halo 2 campaign on legendary, some if it single player some of it split-screen multiplayer with my brother, ‘ray the slayer,’ and never got the achievements for it
-Tighten up the graphics, Cairo station, Outskirts, Metropolis, The Arbiter, Oracle, Delta halo, Regret, Sacred iron, Quarantine zone, Gravemind, Uprising, High charity, The great journey, Warrior, Hero, Legendary anniversary, Big green style, LEGEND.
-It’s possible I also got the par-score achievements for each level, but it shows all my scores as zero so you don’t need to give me those, although I’m sure it’s near impossible to not to get par score on legendary mode.

  • All these should be between the dates of December 15th of 2015 and December 18th of 2015 (you may have to look around at each end of these dates, as I’m not entirely sure).
  • I don’t believe I ever got the achievements
    If you look at my brother’s record, as he did get all of these achievements, I hope you will be able to fix this. I can also send pictures of game, showing that I beat every level on legendary.
  • Edit: I replayed some and got credit for beating only Cairo Station on legendary, but got the achievements for Oracle, The Arbiter, Metropolis, Ourskirts, and Cairo Station. I still need the others. A few more of the missions popped up as complete on halo waypoint, yay, only one year late…
    Thank you

I FOUND A SOLUTION
Simply replay the campaign regardless of difficulty