You can unlock two characters in Tournament Mode. The first character, Killin, can be unlocked by playing through half of Tournament Mode (so, through the first four "tournaments"). The second character, Nemo, can be unlocked by playing through the second half of Tournament Mode to the very end.
Unlockable: Level Concept Art
Shoot the Secret Skullshots in all stages of a given area to unlock its concept art.
Perform the actions below to unlock the following levels:
* Bunker - Beat the Manor House Tournament.
* Manor House - Beat the Warehouse Tournament.
* Ocean Liner - Beat the Prison Cells Tournament,
* Prison Cells - Beat the Venice Tournament.
* Venice - Beat the Steel Mill Tournament.
* Warehouse - Beat the Ocean Liner Tournament.
* Warzone - Beat the Bunker Tournament.
Unlockable: Real Difficulty
Beat all the tournaments to unlock "Real Difficulty."
Unlockable: Character Concept Art
To unlock Concept Art for the following characters, perform the actions below after beating all 8 tournaments once:
* Adjo - Beat any Tournament as Adjo.
* Dragov - Beat any Tournament as Dragov.
* Finn - Beat any Tournament as Finn.
* Killen - Beat any Tournament as Killen.
* Kuro - Beat any Tournament as Kuro.
* Nemo - Beat any Tournament as Nemo.
* Renwick - Beat any Tournament as Renwick.
* Seager - Beat any Tournament as Seager.
Unlockable: Unique Character Endings
To unlock a unique character ending for the desired character, beat the any tournament a second time after first beating all 8 once.