Here is the full list of all 50 One Piece Burning Blood achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
All achievements unlocked
Complete a poster in Rayleigh's Training "Pirate King Training" in WANTED Versus
Complete a poster in Rayleigh's Training "New World Training" in WANTED Versus
Complete a poster in Rayleigh's Training "Basic Training" in WANTED Versus
Complete a poster in the Wanted List "A Queen's Request" in WANTED Versus
Level up a battle character to max
Complete a poster in the Wanted List "After Meal Workout" in WANTED Versus
Use at least 30 support characters and win the battles
Perform a total of at least 5 Unity Clashes
Perform a total of at least 10 Unity Assists
Earn at least 100,000,000 Beli in total
Complete a poster in the Wanted List "Big Eaters" in WANTED Versus
Complete a poster in the Wanted List "Beauty is Strength" in WANTED Versus
Complete a poster in the Wanted List "The Iron Captain" in WANTED Versus
Complete 50 wanted posters on the Wanted List in WANTED Versus
Complete all Paramount War chapters
Unlock all support characters
Complete a poster in the Wanted List "Secret of Youth" in WANTED Versus
Complete a poster in the Wanted List "Aiming for Admiral" in WANTED Versus
Complete a poster in the Wanted List "Brave Brigands" in WANTED Versus
Unlock over half of the support characters
Complete a poster in the Wanted List "Mermaid's Surprise" in WANTED Versus
Use at least 30 battle characters
Swapped with partner at least 100 times
Perform a total of at least 10 Unity Chains
View 50 different appeal events
Unlock all battle characters
Defeat at least 100 opponents
Perform a total of at least 30 Ultimate Attacks
Complete a poster in the Wanted List "Bride's Training" in WANTED Versus
Complete a battle in every stage
Add 100 entries to the Keyword Log, then view your Collection
Complete a Special Wanted Poster in WANTED Versus
Clear the Paramount War Episode "Ace"
Clear the Paramount War Episode "Akainu"
Unlock over half of the battle characters
Clear the Paramount War Episode "Whitebeard"
Clear the Paramount War Episode "Luffy"
Fight an Online Ranked Match
Earn a title
Earn an emblem
Fight an online Player Match
Reach level 5 with any battle character
Unlock all modes
Perform a Grand Impact for the first time
Unlock a battle character
Unlock your first support character
Call out your first support character
Level up a battle character
Complete a Paramount War chapter