My waypoint gamerscore is 27, I just completed Reach on Heroic, I have the "Folks Need Heroes" Achievement; Yet when I go to CQB in my armory, it's locked, saying that I am "missing some of the prerequisites need to purchase this item". Now I have read dozens of answers on this spreading from update waypoint career to finish Halo 3 ODST campaign and do Reach on legendary. Would someone please just give me one CORRECT answer on why this is not unlocking? Must I play though on legendary?