Just found out that after i completed the dead money dlc. Got all the achievments, explored everywhere,collected every major item. I can't leave through the gates back to the Mojave without the game crashing....

Well that svcks I know how that feels the game crashed a few times for me when I just try to save or open a door. Do you have another save that you could load maybe the autosave and see if anything happens?

i had an auto save back at the vault but it would still crash...

You're going to have to wait for a patch bro. Unless you have a cowboy hat...

I guess ill make a new living here in the Sierra Madre. lol

Watch out for Ghost People