[2019] I just signed into XBL and got this achievement in the main menu, I haven’t booted up Halo 5 in almost a year. Was there an update?

Hey!

Thanks for posting about this. I've been sorta watching for anything related to this achievement because I've been driving some behind the scenes fixes to try to get this achievement fixed. (It's been in a weird state for a while.)

It seems to be working now which is exciting.