Exactly the opposite.
Are you sure this is what you intended to say? That reducability (or completeness) means NOT "all true theorems can be proved"? You're aware the Godel's proof is called the incompleteness proof?
Godel proved that any logic that contained quantifiers, (For some, For Every) would be incomplete and inconsistent.
No, he didn't. That's an easy assumption to make, and I made it when I was younger, much to my eventual embarassment. Universal and particular Quantifiers can be used to state the axioms of plain geometry, for an obvious, not to say, classical example. Quantifiers don't necessarily imply specifiable, logically tractable sets--barbers in villages that don't shave themselves come to mind.
When you try to run the proof over a continuous domain, you find that you have no contained sets to map to the Godel strings that represent particular theorems+theirProofs. You need sets to complete the proof, and continuous domains of discourse are not about discrete sets of things, they are about continuous things. You could just try to run Godel's proof over plane geometry, instead of arguing with me about it.
Godels proof is so powerful that it blew the bottom out of mathematical logic and consigned to a sidebar in the history of Philosophy.
Um, well, it blew the bottom out of the grand project to formalize all of mathematics. As far as I can tell meta-mathematics is still alive and kicking. It's a great proof, but it ain't a universal solvent.