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