Randomly unlocking achievement - Help?

So I decided there’s no need to have my Xbox 360 set up if my Xbox One now has backwards compability, however just before I put away my Xbox 360, my console launched Halo 4. I decided to have a brief look back at the game in comparison to Halo: MCC version of Halo 4.

However, as the game started up, I randomly unlcoked 9 achievement for for 300G.

I have not played the 360 version of Halo 4 for around a year, with my most recent game dating back to 20/08/14, so I am wondering if there’s been some form of update that I’ve missed regarding achievements. Just want to know if anything strange is going on or if everything fine.

If you recall a while back, some of Halo 4’s achievements were glitched in a way that they wouldn’t unlock when the prerequisites were met. 343 has since fixed the issue, and since you’re logging on to Halo 4 for the first time in a year, you’re just now unlocking those achievements.

> 2533274883157952;2:
> If you recall a while back, some of Halo 4’s achievements were glitched in a way that they wouldn’t unlock when the prerequisites were met. 343 has since fixed the issue, and since you’re logging on to Halo 4 for the first time in a year, you’re just now unlocking those achievements.

I recall there being some issues, so its good to here there has been a fix, most likely what the update was then. Just needed some confirmation. Thank You!

Although, for some of them, I doubt I’ve actually done them (the pre-requisites). E.g. 5 ‘airassassinations’ I only ever remember doing that once or twice at most.

It happened to me too! MP achievements just popped when I lunched the game and I am sure that I never completed the prerequisites for getting those (supposedly glitchy) achievements. It will help me for “achieving” the game, but I feel bad a little bit.