Banjo-Kazooie

As this achievement is so challenging, I feel it deserves a guide.
After you finish Spiral Mountain (i.e. when Bottles fixes the bridge), and you enter Grunty's Castle, grab the Jiggy from the left side, and use it in the portrait in the right room, you open Mumbo's Mountain.
This is where Mumbo is (see, this is really tricky stuff here).
To get to Mumbo, you need to climb the hill in front of you when you enter the level, then enter the hut that looks like his face (a skull).
He'll tell you to find 5 Mumbo Tokens (original name).
You know when you've picked up a Mumbo Token when it makes a noise like 'Eekum Bokum' (You can remember that for the end-game quiz)
The first token in this world was behind the little mound with a Jinjo on at the begining of the level. The second is inside the ant hill (near Mumbo's Skull).
The third is under the path to Mumbo's Skull (It's literally right in front of the skull).
The forth is all the way over by Konga (not to be confused with Donkey Konga, the game, or King Kong, the movie). When you give Chimpy the orange, and the platform moves up, jump up it, and jump across the raised platforms to the left. The final skull is at the top of the level. It's behind what clearly is not a misrepresentation of the Stonehenge.
When you have collected all 5 Mumbo Tokens, go back to Mumbo's skull. Go Inside. Stand on the skull on the floor (this guy really has problems, so many skulls...) and press the B button (This one might take a while, I kept pressing A, some try X, some even try the Left Stick, but it has to be the B button).
Ding! The hardest achievement in Banjo-Kazooie is now yours. And you get to play as that kick-ass termite as well. You should feel proud!
(It's kind of sad I can remember where every Mumbo Token is off by heart XD)

Mumbo Jumbo - 10G (Original Achievement)

Difficulty: Very Easy

Estimated Period of Time: Very Short
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The goal here is to be transformed by Mumbo Jumbo for the first time, and you should get this is the level Mumbo's Mountain.

After you start the level you will need to find and collect the 5 Mumbo Tokens that look like Silver Skulls.

1. At the entrance you will see a small raised part of land with a Pink Jinjo standing on it, the 1st Token is behind this land.

2. At Mumbo Jumbo's hut, you will find this one under the ramp leading up to his front door.

3. Inside the Giant Termite Hill, you will need the Talon Trot ability that is taught in the stonehenge looking area to be able to climb up the Termite Hill enough to get to it.

4. Behind one of the pillars in the Stonehenge looking area.

5. On a platform near Conga the Ape. You will need to climb Conga's Tree and Steal the orange. Then go behind him and give the orange to Chimpy, who will raise the log for you to get up higher. Go past the location where you learn to use eggs and jump from platform to platform along the wall to get this one.

Once you have all 5, go back to Mumbo Jumbo's Hut and go inside. From here you must stand on the Skull Switch in the center of the room and wait for Mumbo to stop talking before pressing the X button to transform.

Achievements Guide - Banjo Kazooie.

Get jiggy - 10G

Mumbo jumbo - 10G

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Obrigado. Thanks.