Well, what exactly does SnS II do? Besides these titles, they do nothing in Banjo-Tooie?
And, I like the idea of unlocking them through achievements, though I feel that a physical item should have been created as well. Such as beating every boss, then a SnS II egg appearing somewhere.
This is interesting. You named this the fifth part of SnS II. I'm assuming you meant the 4th being the who's boss one?