Banjo-Kazooie
Infinite Gold Feathers
Type CHEAT into the sandcastle floor of Treasure Trove Cove. Then enter: AGOLDENGLOWTOPROTECTBANJO. Now you have infinite gold feathers.

Infinite Lives
At the sand castle (Treasure Trove Cove) spell out "CHEAT" and then "LOTSOFGOESWITHMANYBANJOS". Remember, you won't hear anything signifying that you've done it right until the very last letter, so make sure you don't mess up!

Infinite Air
In the sandcastle (Treasure Trove Cove) spell out "CHEAT" and then "GIVETHEBEARLOTSOFAIR". This will give Banjo-Kazooie and infinite amount of air.
 Infinite Gold
 Feathers
 Infinite Lives
 Infinite Air
 Maximum Energy
 Infinte Eggs
 Infinte Mumbo
 Tokens
 Infinte Red Feathers
 Big Head Banjo
 Wahing-Machine BK
 Tall & Skinny Banjo
 Gaint BK
 100 Red Feathers
 200 Eggs
Maximum Energy
In the Sandcastle (Treasure Trove Cove), Beak Bust in "CHEAT" and then: ANENERGYBARTOGETYOUFAR. This will give you the max of eight pieces on your life/honeycomb bar. Note that if you have Red Honeycombs already it will take them away.

Infinite Eggs
On the sandcastle floor (Treasure Trove Cove), type in 'CHEAT' and you will hear a moo sound. Then type in 'BANJOBEGSFORPLENTYOFEGGS'. It will not make a noise acknowledging the letters, so make it perfect!

Infinite Mumbo Tokens
Type in "CHEAT" at the sand castle floor (Treasure Trove Cove) and then enter: DONTBEADUMBOGOSEEMUMBO. You won't hear any sound, but if you did it right your Mumbo Tokens will increase to 99.

Infinite Red Feathers
Start by typing in "CHEAT" at the sand castle (in Treasure Trove Cove). Then type in "NOWYOUCANFLYHIGHINTHESKY". You won't hear or see anything when you type in the letters so make sure it's perfect.

Big Head Banjo
Go up to the Bottles picture above the fireplace in Banjo's Home. Hit Top-C and look at the picture (you may have to reposition yourself a few times to get it to work). If you have the Jiggy from the sandcastle in Treasure Trove Cove, you can play a mini puzzle game. You have to put together the puzzle and then go back to Treasure Trove Cove. In the sandcastle, spell out BOTTLESBONUSONE. Banjo will get a big head! Spell NOBONUS to reverse it!

Washing-Machine Banjo-Kazooie
Go into Banjo's house and look at the bottles picture using C-Up. He will start talking. Play through the first, second, third, fourth, fifth and sixth puzzle challenges and Bottles will tell you that there is no more. He's lying. Go back and play again. If you beat the puzzle you will be rewarded with another code: WISHYWASHYBANJO. This code turns Banjo-Kazooie into a washing-machine. Simply go back to the sand-castle in Treasure Trove Cove and spell out the code to activate it. Note: code will not work unless you have actually beaten the puzzle challenges.

Tall and Skinny Banjo
Go into Banjo's house and look at the bottles picture using C-Up. He will start talking. Play through the first, second, third and fourth puzzle challenges and you will be rewarded with a code: BOTTLESBONUSFOUR. This code enables tall skinny Banjo. Simply go back to the sand-castle in Treasure Trove Cove and spell out the code to activate it. Note: code will not work unless you have actually beaten the puzzle challenges.

Giant Banjo-Kazooie
Go into Banjo's house and look at the bottles picture using C-Up. He will start talking. Play through the first, second, third, fourth, fifth and sixth puzzle challenges and you will be rewarded with a code: BIGBOTTLESBONUS. This code enables big head, big hands and feet Banjo + big head and wings Kazooie. Simply go back to the sand-castle in Treasure Trove Cove and spell out the code to activate it. Note: code will not work unless you have actually beaten the puzzle challenges.

100 Red Feathers
Enter "REDFEATHERS" in Treasure Trove Cove world on the Sand Castle Floor after you talk to the Spell Book in Mad Monster Mansion. Your Red Feather max limit will go up to 100 (instead of 50.) Have Mumbo Jumbo turn you into a pumpkin in the Mad Monster Mansion world. Then leave and go up the winding path where Brentilda is waiting (volcano). Now go into the small hole and follow the cave path and you'll meet up with one out of the three spell books in the game.

200 Eggs
To be able to get 200 eggs, go to the Bubblegloop Swamps an let yourself be changed into the crocodile. Exit the level and turn to your left (Banjo's right) and go to the pipe in the back, which leads to the snow world puzzle map. When you are there, go through the pipe at the top of the hill and you will find a spell book guy. He gives you the code: BLUEEGGS, which you need to enter in the sand castle in Treasure Trove Cove. Note:This code only works if you have talked to the spell book.
Credit Goes To: IGN 64