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