Assuming that you do want to get the badge and you always (very unlikely) ask questions that never need to be edited (and if they are, never need to be rolled back). You can get this badge by editing your post and then rolling back to the first revision and you will get your badge.
jcsanyi's answer isn't correct in saying it's not enough to do that, I've tested it and it is. Although StackExchange probably should implement it to prevent people from doing this just to get the badge.
It just takes a couple of minutes before the badge is given to you (like all the badges). So don't constantly rollback until you get it.