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