One Piece: Grand Battle (GBA)

Axe-hand Morgan Statue
Complete level 1-3.

Billow-a-bike
Complete level 6-3.

Boss Battle Mode
Collect all coins.

Cat's Claw
Complete level 3-3.

Chakram
Complete level 3-2.

Chouchou's dogfood
Complete level 2-2.

Elephant Tuna
On level 6-1, have Sanji talk to a woman.

Free Food
Complete level 4-2.

Gas Mask
Complete level 4-3.

Gum Gum Fruit
Complete level 2-3.

Hatchan's Octopus Trap
Complete level 5-2.

Lollipop
Complete level 4-3.

Mackerel Head One
Complete level 4-1.

Map of the grand line
Complete level 2-3.

Master of the Near Sea
Complete level 5-2.

Mini-game mode
Finish the game once.

Shigure
Complete level 6-2.

Special Buggy Ball
Complete level 2-3.

Straw Hat
Complete level 4-3.

Tooth Gum
Complete level 5-3.

Usopp's Sling shot
Complete level 3-3.

Wado
Complete level 1-2.

Zolo's Stomach Band
Complete level 1-3.