Here is the full list of all 40 ONE PIECE: PIRATE WARRIORS 4 achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Unlocked All Achievements
Cleared the Deciding Battle Episode from the Treasure Log “New World”
Collected 100 million or more berries in total
20 or more characters’ Crew Levels have MAXED out
Promoted to Treasure Log “Grand Line”
Toppled a total of 100,000 foes
Cleared at least 1 “East Blue” battle from the Treasure Log
One character's special moves have all MAXED out
Cleared Dramatic Log “Land of Wano Arc (game original)”
Cleared Dramatic Log “Whole Cake Island Arc”
One character's Action Growth Level has MAXED out
Acquired 20 or more skills
Collected 30 or more playable characters
Unlocked at least 75% of the Gallery
Cleared Dramatic Log “Entry to the New World Arc”
Acquired all the islands from
Toppled 10,000 enemies during a Full-Force Burst
You won a battle with a Sky type character for the first time
Cleared Dramatic Log “Summit War Arc”
Collected 50 types of coin or more
Cleared Dramatic Log “Enies Lobby Arc”
You used Power Dash 1000 times or more in total
One character's Crew Level has MAXED out
Total Stage Objects Destroyed has exceeded 1000
Unlocked at least 25% of the Gallery
Collected 10 or more playable characters
You won a battle with a Technique type character for the first time
One of your skill levels has MAXED out
Achieved Battle Grade S in any episode
Cleared Dramatic Log “Alabasta Arc”
Acquired 1 or more skills
You won a battle with a Speed type character for the first time
You stayed airborne for at least 10 seconds
You won a battle with a Power type character for the first time
Cleared Dramatic Log “Introduction”
You used a special skill at least 10 times in one battle
You defeated your first enemy while in Form Change.
You defeated your first enemy using Full-Force Burst
You used a special skill for the first time
You defeated 1000 or more enemies in a single battle