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All 22 Locked Treasure Chests - One Piece Odyssey

There are a total of 22 Locked Treasure Chests in One Piece Odyssey, 8 in Waford, 4 in Alabasta, 5 in Water Seven, 1 in Marineford, and 4 in Dressrosa. To open these chests you need a special key which you will get when you complete all four side stories involving the "Zoners":

Grand Line Quiz Kid Level 1 / 2 / 3 (Alabasta)
Grand Line Quiz Lady Level 1 / 2 / 3 (Water Seven)
Grand Line Quiz Madam Level 1 / 2 / 3 (Marineford)
Grand Line Quiz Mister Level 1 / 2 / 3 (Dressrosa)

Once you open all 22 locked treasure chests, you will unlock the "Treasure Hunter" achievement / trophy.

Index

All known locations on the map Waford

Sky Tower Locked Treasure Chest▶ show the map ◀

Contains: Waford Necklace - A cube fragment containing extracted power of superior technology from Waford's days as a Sky Island (TP Efficiency +60%).

Sky Tower Locked Treasure Chest▶ show the map ◀

Contains: Odyssey Necklace - A cube fragment containing concentrated power extracted from the Straw Hats' adventurous spirit (GUTS +900).

Waford South Locked Treasure Chest▶ show the map ◀

To get here you must use three Zoro's Cube Fragments to upgrade his "Door Slice" field skill. Contains: Wild One's Necklace - A cube fragment containing concentrated power extracted from various wild monsters (GUTS +620).

Waford South Locked Treasure Chest▶ show the map ◀

Contains: Shock Element Jewelry - A cube fragment that adds lightning to your attacks. Only effective when the type added is a weakness.

Waford South Locked Treasure Chest▶ show the map ◀

Contains: Waford Ring - A cube fragment containing extracted power of superior technology from Waford's days as a Sky Island (HP Auto Regen +500).

Waford South Locked Treasure Chest▶ show the map ◀

Contains: TP Auto Regen Jewelry - Regenerates TP every turn (TP Auto Regen +70).

Waford South Locked Treasure Chest▶ show the map ◀

Contains: HP Auto Regen Jewelry - Heals HP every turn (HP Auto Regen +250).

Waford South Locked Treasure Chest▶ show the map ◀

Contains: HP Conversion Jewelry - A cube fragment containing special, extracted power. Heals HP based on damage dealt to enemies (HP Drain +10%).

All known locations on the map Alabasta

Desert Near Nanohana Locked Treasure Chest▶ show the map ◀

Contains: Waford Crown - A cube fragment containing extracted power of superior technology from Waford's days as a Sky Island (HP Drain +20%). To get here Franky must be with you, because he can build the bridge.