Hello Trophy Hunters,
This is for completing arcade mode with a character. Any character will do. Depending if your a veteran to Blazblue or a new person to the series I would recommend Ragna "The Bloodedge". Reason I recommend him is that he does ample damage and his combo's are easy for beginners.
As for the arcade mode there is 10 fights with 2 rounds each.
This trophy should unlock at the credits of your first arcade completion.
Happy Hunting.