During my last play through, I could not get the Assault Vault 88 Conqueror quest to complete. After digging through these here forums (for the life of me I can't find the thread to link it) someone else posted a similar problem. What they ended up doing was killing the Overseer (who was not hostile) and their quest completed. During the Vault 88 quests, I ended up pissing off one of the three starter settlers, so she left. The Overseer left too. By the time I scheduled my raid, those two were never to be found and the quest wouldn't complete. I even tried to summon the Overseer via console commands. I even cloned her. But nope. So, my next time through (I'm a whopping level 11 right now!) I will do two things: 1: Keep the Overseer in the vault. 2: Keep the starter settler in the vault. The first one may be hard because she's gonna be right pissed off that I did the 'happy' things to keep the other settler from leaving. (I want the happy bonus for the slot machine anyway). But, I reckon that by having all the NPC's assigned to the Vault still in the vault, I should be able to complete the quest. FYI: I couldn't find the proper QuestID to trigger its successful completion. Believe me lawdy lawd, I tried.