2 things... first, 2 all u spammers, SHUT THE FÜCK UP NOW and next, some of the levels are pretty much impossible to get all 3 achievements, cuz u stil have to have all glades...
lol funny, get dual lever shotgun, and dual glock pistol, then in Meduim house, just sit on the ledge on the righ, and shoot any1 who comes past, twice with the shotties. when ammo out, jump >>> and pick up ammo, then clear bottom and get back up