There really isn't a precise metric for being "AAA" or even a solid definition of the term. Generally it means the game in question had a large budget, which usually translates to having a large team and lots of promotional spending. But how large is large? Nobody can really agree (or has really bothered to try), just like nobody agrees on how many concurrent players you need to be a "massively" multiplayer game.
Most people would probably agree that games with budgets in the millions are "AAA," and games with budgets in the thousands aren't. But the middle? Is a hundred thousand dollars an AAA game? What about half-a-million?
If you want to call your game a AAA game, go for it. If you "pull it off" in the sense that your game manages to wow people enough that they don't disagree with that assessment, then I guess you're a AAA game (or similarly, just wait until people start calling your games AAA or calling your studio a AAA studio).