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 Dream Log.
Complete the "Final Island" in the Dream Log.
Unlock all Characters.
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.
Use Hero Power at least 100 times.
Obtain 20 or more Skills.
Complete 15 or more islands in the Dream Log.
Obtain 100 or more types of Coins.
Complete five or more islands in the Dream Log.
Defeat over 100,000 enemies.
Complete the Final Chapter of the Legend Log.
Unleash a Special Bond Attack with four Crewmates.
Complete the Fourth Chapter of the Legend Log.
Defeat over 10,000 enemies using Special Attacks.
Complete 25% or more of the Gallery.
Complete the Third Chapter of the Legend 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.
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.
Obtain one Skill.
Unleash your first Hero Power.
Achieve 100% Legend Points in a single episode.
Obtain one Coin.
Obtain one Skill Poster.
Get an S-Rank Results Evaluation for a single episode.
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.