On the bright side, the achievements in this are extremely easy. Just get some kills with the weapons and demon, wear the armor, and use a taunt and you're done. You'll almost certainly knock all of these out within an hour.
That's not really true at all. The kill X amount with X weapon-related achievements aren't cumulative and have to be done in one match. Trying to kill 5 enemies with the Kinetic Mine is proving rather difficult.