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