Autism is the product of having a differently wired brain than a non-autist does. It's something you're born with, not something you can get later.
Certain medications used by pregnant women can result in children being autistic, but I seriously doubt that this extends to any vaccines as well. Perhaps some really exotic ones maybe, but common vaccination definitely not.
Source: I am autistic, read up on it to be able to better deal with it and am dealing with it on a daily basis.
And truth be told, I don't know if I'd be better or worse off without it. It doesn't make my life unlivable and I guess the understanding of autism of most people is too much based on rumor-mongering and hearsay, than any actual facts.