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