Not getting the achievement when I've performed it multiple times

Hello Admiral JG, there was a problem yesterday with Achievements not only yourself were having these problems but everyone else on Xbox one. Your Achievement should unlock by itself in a couple of days .

I'm having this problem with the last two online co-op achievements, I've completed the criteria multiple times but still no unlocking, getting frustrated because I've rang multiple times and been given multiple different answers, please help xbox support

I performed the steps shown in the Achievement Troubleshooter but they didn't work. I'm already connected to Xbox live, it's been several days since I earned the achievement, I've hard restarted my Xbox multiple times, and the achievement is still not unlocked.
If I look at every single mission, it says I've beaten them all solo legendary. Is there anything else I can do?

I also have the same issue with the day one achievement. I've performed ultras in multiple modes with no pop. I have gotten others to pop, though.

hi have you performed a cold restart to clear your cache i know that sometimes games may get a bit glitchy time to time its happened to me on multiple occasions and as soon as i did a reset it would pop up sometimes four different achievements at a time