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