Unlockables - Complete each achievement to get the allotted gamerscore.

20 MVPs (25) Be the MVP player 20 times in any mode.
50 Wins (25) Win 50 games in any mode.
Arena Master (15) Play at least once on each arena.

Ball Master (10) Use each ball in a game at least once.

Destroyer (10) Knock out opponents using each character's Super Shot.
Double KO (15) Knock out 2 or more opponents at once using the Shooter's Super Shot.

Finisher (5) Knock out an opponent using a Super Shot.

Line Master (10) Play at least once with each line and each ground variation.

Party Time! (15) Play in a game with eight players on Xbox LIVE.
Perfect Player (25) Win a match on Xbox LIVE without getting knocked out.
Perfect Team (35) Win a 6 vs 6 Xbox LIVE round without any teammates getting knocked out.

Ranked Veteran (10) Win at least 5 ranked matches on Xbox LIVE.