Successfully complete the indicated task to unlock the corresponding icon on the menu with the "New Game" and "Continue" options. Get all the icons to unlock an alternate title screen.
G Comp Star: Collect all 5 Giga Class Cards.
M Comp Star: Collect all 42 Mega Class Cards.
Mu Continent Star: Defeat RaMu Xa.
OoPart Star: Defeat ApollonFlame.
Rockman Star: Successfully complete the main story line.
S Comp Star: Collect all 150 Standard Class Cards.
Alternate ending
Successfully complete the game with all achievement icons. You will have a message from Solo asking you to level up the four In-Game Brothers. Do their side quests to level them up, then complete the game. An alternate sequence will appear after the credits, ending with a battle against BuraiSX.
Alternate final Boss
Unlock all the achievement icons. Play through the game again to fight the Xa version of the final Boss.