So i took the quest from the ghoul in Underworld. I said yes, i would kill the guys for him. After that, I talked to numerous people in underworld that told me the guy was a crook, and the people he told me to kill are good people. So I went back and told him I wouldnt kill them anymore (exact line was something like "Fuck you ill keep the keys to myself"). So the guy starts shooting at me, and everyone in town also shoots at me. I came back numerous game days latter, and the town was ok with me but each time I get near to the guy, he shoot at me.
So I decided to go see the guys I need to kill, to end the quest another way. The 1st I saw was the guy in Rivet City. I have 100 speech so he gave me the key. Went back to give it to the dude in underworld, but he was still hostile.
So I went to tenpenny tower, talked to tenpenny about my situation, and tenpenny offers me 300 caps to kill the ghoul. At this point I thought it was a good way to end the quest, so I went and killed the Ghoul.
After that, the quest says "collect your prize from tenpenny". I went to tenpenny, but he keeps telling me to go kill the ghoul, even if I did it. So at this point I think I broke the quest system, and wont ever be able to get this achievement.
The only workaround Im thinking of, is to go see the other 2 guys I was suppose to kill at the beginning, but I have little hope.
Any idea how I can get out of this situation ?