There are, at the time of this question, 209 threads on Battle.net concerning the Bloodstained Letter lore item needed to complete the Primary Sources achievement.
My primary character, a barbarian created on launch day, has been unable to complete this achievement - the Bloodstained Letter simply does not drop, nor as far as I can tell has it ever dropped. It does not appear in my lore list, the achievement is open, and after days of grinding the Keep Depths, continues to elude me. I've never seen the lore - not in Normal, nor Nightmare, nor Hell nor Inferno (where my character currently is).
Blizzard maintains that the Bloodstained Letter is not bugged.
Is it correct that:
- the Bloodstained Letter should drop from a Dead Solder corpse in The Keep Depths, only on a Dead Soldier (not a Dead Guardsman) and only in the Keep Depths (i.e. not in other dungeons)?
- the Dead Soldier corpse does not always appear (it's a random occurrence)?
- the Dead Soldier should always drop the Bloodstained Letter if his corpse appears?