Here is a gameplay video of the soon to come N64 classic in its XBLA version. It even lists the Achievements, which are as follows:
Get Jiggy - 10G
Collect 2 Jiggies
Mumbo Jumbo - 10G
Transformed by Mumbo for the first time.
Knock out Nipper - 15G
Come out on top in a dust-up with Nipper the crab. Watch out, he's called Nipper for a reason.
Free Clanker - 15G
Liberate Clanker, Gruntilda's rusty and recalcitrant garbage grinder.
Chomp Chomp! - 15G
They're red and no less than 30 of them need chomping. Nuff said.
Move Master - 15G
Discover and master all Banjo's moves… and Kazooie's… but nobody else's. Unless you insist.
Show me the honey! - 15G
Collect all 24 of the extra honeycomb pieces. Yes! Every single one! It's character-building.
The Quiz Master - 20G
Complete Grunty's Furnace Fun quiz show and win the Star Prize. Been paying attention?
Jinjonatored - 20G
Fear the Jinjonator. If you're a witch, that is. The Jinjonator lays the smack down on witches.
Jigsaw maker - 20G
Bet you thought jigsaws were boring! Bottles disagrees, and has seven of them to be solved.
Cheating Cheato - 20G
Bump into Grunty's disowned spellbook three times as it hops around the place dishing out cheats.
Music Maestro - 25G
There are 900 musical notes out there in the world of Banjo-Kazooie. Real gamers collect them all…
(via Spiral Mountain
[edit: It seems like Rare finally got to the person who uploaded the footage, since it has now been removed from youtube again] read