I know there are many questions on this, but I think this is different. I was pretty sure that the only melee weapon I needed for the melee mayhem was the revolver from Chapter 3. I went ahead and used the revolver as a melee, and then I just ran through and finished the chapter. I'm wondering if it wiped out all of the other weapons I had used in Chapter 3 b/c I still didn't get the achievement. For instance, I know the sign is only available in this chapter and I didn't use it this time through so I'm thinking it isn't counted anymore. Should I go back and do Chapter 3 using all weapons available again, or should I just start over from the beginning of the game?
Thanks!