Full list of all 63 ONE PIECE World Seeker achievements worth 1,600 gamerscore. It takes around 25-30 hours to unlock all of the achievements in the base game.
The base game contains 43 achievements worth 1,000 Gamerscore, and there are 4 DLC packs containing 20 achievements worth 600 Gamerscore.
Ask Straw Hat Pirates to go exploring 12 times
Learn all Skills
Reach Pirate Rank 100
Complete 100 Side Missions
Ask Straw Hat Pirates to go exploring 3 times
Create 20 equipment items & outfits
Open 200 treasure chests
Perform 30 Perfect Guards
Acquire 20 pirate box lunch recipes
Fly with Gum Gum Rocket for 30 minutes in total
Acquire 25 equipment & outfit plans
Complete All Main Missions
Complete Main Mission "Sky Prison, Ho!"
Defeat 6 enemies simultaneously
Complete Main Mission "Protect All"
Complete Main Mission "Radio Hijack"
Complete Main Mission "To You"
Complete Main Mission "The Old Island"
Reach Pirate Rank 50
Learn 40 Skills
Reach a Sky Island for the first time
Perform 30 Perfect Dodges
Attain 100% Karma for one faction
Explore the entire island
Defeat 1,000 Enemies
Complete 20 Side Missions
Defeat 100 Pirates
Defeat 100 enemies with a Takedown
Perform 100 critical shots
Reach Pirate Rank 10
Complete Main Mission "Straw Hats United"
Learn 10 Skills
Perform 10 critical shots
Break 100 objects
Travel a total distance of 50,000 across the island
Defeat 200 Sailors
Complete Main Mission "Suspicious Woman"
Open 15 treasure chests
Fly for 5 seconds during a single Gum Gum Rocket flight without landing
Complete first Side Mission
Acquire 100 materials in total
Defeat 10 enemies with a Takedown
Complete Main Mission "Find Chopper!"
Learn all of Zoro's Skills
Perform Relentless 25 times
Use Serious Mode 10 times
Complete a Challenge Mission with the highest grade with Zoro
Complete 3 Challenge Missions with Zoro
Complete Main Mission "The Void Mirror Prototype"
Complete all Main Missions in "Where Justice Lies"
Learn all of Sabo's Skills
Takedown 20 enemies as Sabo
Do 30 Flame-Flame Perfect Dodges
Clear 4 Challenge Missions as Sabo
Get the top Grade as Sabo on 4 Challenge Missions
Complete all Main Missions in "The Unfinished Map"
Learn all of Law's Skills
Takedown 20 enemies as Law
Use Shambles on an Enemy 30 times
Clear 2 Challenge Missions as Law
Get the top Grade as Law on 2 Challenge Missions
Complete "Boss Rush" with the top Grade
Complete the "Boss Rush" Challenge Mission