All the Journals have now been documented. "Battlefield Reports" in particular I believe is related to a bugged Event Quest you get from a Guardsman in the Fields of Slaughter, and therefore is unobtainable right now.
Does anyone remember what container "Bloodstained Letter" drops from?
For anyone who is trying to complete their lore achievements, I just want to bring attention to our Journal section - a comprehensive and growing list of all the journals that can be found in the game, including information on where and how to find them. Even if you're not shooting for the achv, we've made the effort to also document how much XP they give for your leveling convenience.