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