Achievement Glitches

I have 2 achievements Scovillain & Firebug that in game say I have completed but never got the achievements for. I’ve gone back and done them several time but to no avail. So what do I do now?

IME this happens if you lose connection to XBL servers while you’re playing for any reason. Unfortunately there doesn’t seem to be an easy fix for this. You could try forcing a re-sync of your save files by doing a power reset to clear the cache, although I’m a little dubious that this would trigger the achievements. Other than joining the game of someone else who hasn’t completed them, you may need to simply replay the DLC using a different character.

Thank you much. I shall give that a try. Really appreciate the info