Here is the full list of all 40 One Piece Pirate Warriors 3 achievements. It takes around 100-120 hours to unlock all of the achievements on Windows.
Achieve 100% Legend Points in all episodes.
Increase 20 or more character's Crew LEVEL to MAX.
Complete the "Final Island" in the Dream Log.
Unlock all Characters.
Break through one Character's growth limit.
Complete the Dream Log.
Complete 15 or more islands in the Dream Log.
Use Hero Power at least 100 times.
Obtain 100 or more types of Coins.
Obtain 20 or more Skills.
Complete the Final Chapter of the Legend Log.
Complete the Fourth Chapter of the Legend Log.
Defeat over 100,000 enemies.
Complete five or more islands in the Dream Log.
Complete the Third Chapter of the Legend Log.
Defeat over 10,000 enemies using Kizuna Attacks.
Obtain 50 or more types of Coins.
Complete the Second Chapter of the Legend Log.
Complete 25% or more of the Gallery.
Increase one character's Crew LEVEL to MAX.
Unleash a Special Bond Attack with four Crewmates.
Obtain 20 or more Skill Posters.
Defeat over 10,000 enemies using Special Attacks.
Achieve 100% Legend Points in a single episode.
Get an S-Rank Results Evaluation for a single episode.
Complete the First Chapter of the Legend Log.
Use Kizuna Attacks of 3 different Crew mates in 1 battle.
Defeat 300 enemies using a single Kizuna Rush.
Change Crew members for the first time.
Obtain one Skill.
Unleash your first Hero Power.
Unleash your first Kizuna Rush.
Obtain one Coin.
Obtain one Skill Poster.
Complete the Legend Log Prologue.
Unleash 20 or more Kizuna Attacks in a single battle.
Defeat 1,000 enemies in a single battle.
Unleash your first Kizuna Attack.
Obtained all achievements.
Complete the entire Gallery.