As usual for these achievements, you must play as a band (with two or more instruments). I chose Hard Vocals and Hard/Expert Guitar/Bass (depending on the set). This would obviously be easier if you have two people who are able to play together (or more). There is an 18 song setlist which you must play on at least Hard difficulty level. As well, there are several plays of "Run To The Hills" in this set as well. This is more of a "time committal" achievement rather than difficulty. Good luck!