Dragon Ball: Raging Blast 2

Android 13 – Beat Dr. Gero’s boss mission in Galaxy Mode
Android 14 – Beat Android #13's boss mission in Galaxy Mode
Android 15 – Beat Android #14's boss mission in Galaxy Mode
Bardock – Beat Saibamen’s boss mission in Galaxy Mode
Bojack – Beat Zangya’s boss mission in Galaxy Mode
Broly (SSJ3) – Beat Broly’s boss mission in Galaxy Mode
Cooler – Beat Frieza’s boss mission in Galaxy Mode
Demon King Dabura – Beat Cell’s boss mission in Galaxy Mode
Doore – Beat Neizu’s boss mission in Galaxy Mode
Gogeta – Beat Future Gohan’s boss mission in Galaxy Mode
Gogeta (Super) – Beat Vegito’s boss mission in Galaxy Mode
Gohan (Adolescent ) – Beat Teen Gohan’s boss mission in Galaxy Mode
Gohan (Future) – Beat Ultimate Gohan’s boss mission in Galaxy Mode
Gohan (Teen) – Beat Kid Gohan’s boss mission in Galaxy Mode
Gohan (Ultimate) – Beat Adolescent Gohan’s boss mission in Galaxy Mode
Gotenks – Beat Vegito’s boss mission in Galaxy Mode
Hatchiyack – Watch the ”Dragon Ball Z – The Plan To Eradicate The Super Saiyan!” movie in game
Janemba – Beat Pikkon’s boss mission in Galaxy Mode
Kid Buu – Beat Krillin’s boss mission in Galaxy Mode
Mecha-Frieza – Beat Meta-Cooler’s boss mission in Galaxy Mode
Meta-Cooler – Beat Cooler’s boss mission in Galaxy Mode
Neizu – Beat Burter’s boss mission in Galaxy Mode
Pikkon – Beat Goten’s boss mission in Galaxy Mode
Salza – Beat Dore’s boss mission in Galaxy Mode
Tarble – Beat Vegeta’s boss mission in Galaxy Mode
Trunks (Sword) – Beat Trunks’ (Fighting) boss mission in Galaxy Mode
Turles – Beat Raditz’s boss mission in Galaxy Mode
Vegeta (Majin) – Beat Vegeta’s (Scouter) boss mission in Galaxy Mode
Vegeta (Scouter) – Beat Goku’s boss mission in Galaxy Mode
Vegeta (SS3) – Beat Majin Vegeta’s boss mission in Galaxy Mode
Vegeta (SSJ3) – Beat SSJ3 Broly’s boss mission in Galaxy Mode

Android 13 Beat Dr. Gero's Boss Mission in Galaxy Mode
Android 14 Beat Android 13's Boss Mission in Galaxy Mode
Android 15 Beat Android 14's Boss Mission in Galaxy Mode
Bojack Beat Zangyas Boss Mission in Galaxy Mode
Cooler Beat Frieza's Boss Mission
Demon King Dabura Complete Cell's Boss Battle in Galaxy Mode
Gohan (Adolescent) Beat Teen Gohan's Boss Mission
Gohan (Full Power) Beat Gohan (Adolescent)'s Boss Mission
Hatchiyack Watch "Plan to Eradicate the Super Saiyans"
Majin Vegeta Complete Vegeta (Scouter)'s Boss Battle In Galaxy Mode
Mecha-Freiza Complete Meta Cooler's Boss Battle In Galaxy Mode
Meta-Cooler Complete Cooler's Boss Battle In Galaxy Mode
SS3 Vegeta Complete Majin Vegeta's Boss Battle in Galaxy Mode
SSJ3 Broly Beat Broly's Boss Mission
SSJ3 Vegeta Beat SSJ3 Broly's Boss Mission
Super Gogeta Complete Vegito's Boss Battle In Galaxy Mode
Teen Gohan Beat Kid Gohan's Boss Mission
Trunks (Sword) Beat Trunks (Fighting Teen)'s Boss Mission
Turles Beat Raditz Boss Mission in Galaxy Mode


http://www.gamefaqs.com/xbox360/996390-dragon-ball-raging-bl...
may not be 100% im not sure

All characters are unlocked in Galaxy mode.

Except for the character "Hatchiyack", to unlock it you will need to watch the movie: "Dragon Ball Z - The Plan to Eradicate the Super Saiyan" in the movie section, which is available in the menu.

Note: WATCH THE MOVIE UNTIL THE END, OR SKIP THE SCENES.