To get this trophy you need finish "Play All" (secret chapter). To unlock you need:
1- finish the three parts of Story Mode;
2- unlocked Arctorius and finish the new chapter in Story Mode;
2.1- to unlock Arctorius you need finish the last round of 8th fight in Arcade Mode (any dificult) with Declimation Move (Lv1 or Lv2). After, you fight the secret boss, Arctorius. Defeated him, and defeated Thalessa. After credits you unlocked the new fighter.
3- after finish Arctorius' Story, the new chapter appears called "Play All". Finish the new mode and get the trophy.