Bioware had actually a great idea !

SlyGamer79

its achievement choices either do all multiplayer maps on gold or all N7 maps on insanity which i thought was more fun lol why the hell don't more games have these choices instead of a chunk of your trophies being forced into playing online give a single player option to do the achievements.

I did the N7 maps on insanity because trying to get high lvl people on multiplayer is a chore and it was just easier for me to do it the game on insanity single player because i was already doing it for my insanity trophie so at the end i got unwavering & insanity then knocked out afew minor ones and got my plat :-D