Well i did the seriously glitch and the account that i glitched it off of only had the weapon achievements and seriously. So after i got seriously and the rest of the weapon achievements that i needed i went to boost in annex for those achievements. I was just going to play a bunch of games against one of my other accounts. But after i did one thing for each achievement it gave me that achievement. I thought that that was weird but if that happened maybe i could get other achievements easily also. So i went into campaign as dom and played one chapter and got the last dom achievement. Now i only have one achievement left, find all the cog tags. Has this ever happened to anyone else because i thought this was weird.