Halo Reach's under 3 hours won't unlock

So recently I did the “Keep your foot on the pedrogas” achievement and got a time of 2:13:58 and my achievement never unlocked. It’s been 3 days and I’ve tried doing the cutscene missions solo on legendary without skipping to see if it would trigger it and it never did. Is there anyway to get my achievement to unlock? It would be a huge bummer to do all that for a glitched achievement and in game title.

How did you die in the Epilogue?

Like lone wolf? I blew myself up the first time and then went and did it a few more times and got killed by the elites

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> So recently I did the “Keep your foot on the pedrogas” achievement and got a time of 2:13:58 and my achievement never unlocked. It’s been 3 days and I’ve tried doing the cutscene missions solo on legendary without skipping to see if it would trigger it and it never did. Is there anyway to get my achievement to unlock? It would be a huge bummer to do all that for a glitched achievement and in game title.

Xbox or PC?