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