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