Here is the full list of all 10 THE LAST BLADE achievements.
Play with one of the hidden characters
Clear STORY mode
Start a match in Multiplayer
Play with all characters
In STORY mode, do a « Perfect » round
In MULTIPLAYER mode, win 10 fights
In STORY mode, win 30 fights
In TIME ATTACK mode, defeat 10 enemies with difficulty max
In TIME ATTACK mode, defeat 15 enemies with difficulty max
Clear STORY mode with difficulty max