I was never really worried about achievements. I got all the campaign ones just because they're fun to see and I like the campaign mode. I went for a few of the MM achievements and picked up a couple more just by playing the game. The only achievement I really wanted was the Mongoose Mowdown. I just liked the shoulder armor that came with it. I tried and tried, but driving a mongoose around on a small map during a FFA match was just a K/D killer for me. Add to that, the fact that I really don't like FFA. I wound up with a 15 in Lone Wolves only because I was going for a few achievements