Soul Calibur 2 - Platform: XBox

Alternate costume:
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At the character selection screen, highlight a fighter and press Guard.

Alternate introduction screen:
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Successfully complete all Weapon Master missions. Also unlock every mode, 
weapon, and character to hear Sophitia say "Soul Calibur 2" at the "Press Start" 
screen. Additionally, unlock everything (all characters, modes, artworks, 
costumes, weapons, etc.) to hear Voldo breathing strangely at the "Press Start".

Alternate stages:
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Some of the stages that can be unlocked in weapon master mode have alternates. 
To choose an alternate, highlight the desired stage and press Right or Left. Not 
all stages have alternates, and some have more than one.

Character statements:
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At the versus screen, press any button for one of four different optional 
character statements before the match.

Character profiles:
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Successfully complete arcade mode with a character to unlock their profile.

Voice actor names:
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After unlocking a character's profile in arcade or extra arcade, enter the 
characters' profile. When you are at his/her profile, select "Voice". Once in 
this new menu, press L. A small box just above the menu will appear for a few 
seconds, giving the name of the actor/actress who played the voice of the 
character.

Play as Assassin:
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To unlock Assassin, you must already have weapon master mode completed once. In 
chapter 8, complete the stage "Crystal Mine", in both the extra and normal 
missions. This will open up a path to sub-chapter 3. The second mission in 
sub-chapter 3 is called "Castle Of The Damned". Since you hav already completed 
the game once, you will have an extra mission for "Castle Of The Damned", in 
which your opponents are faster. You must defeat the enemies, who are (in this 
order): Voldo, Ivy, Yoshimitsu, Taki, and Assassin. Complete the level to unlock 
Assassin. He is available in all two player modes except for arcade and extra 
arcade. He is also available in practice and extra practice modes. Assassin has 
six costumes to choose from, and some of the best combo and juggling moves in 
the game.

Play as Cervantes:
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In weapon master mode, complete chapter 3. The last area in chapter 3 (the 
eastern-most mission) will occur on the Pirate Ship level, and the last 
character fought will be Cervantes. When he is defeated, he will become playable 
in all modes.

Play as Charade:
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In weapon master mode, complete chapter 2. The first mission in chapter 3 
(western-most mission) will have you fighting Charade. You can only do a ring 
out to win this match. Defeating Charade will unlock him/her/it in all modes. 
Charade plays much like Edge Master/Inferno.

Play as Berserker:
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Successfully complete all 10 chapters, then replay sub chapter 1. This should be 
a dungeon where you fight lots of berserkers. Defeat the Boss to unlock 
Berserker in all modes except weapon master mode.

Play as Lizardman:
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Successfully complete sub-chapter 2 in weapon master mode. Lizardman will only 
be available in two player team battle mode, versus mode, extra versus mode, and 
basically any mode that involves two players. The only single player mode he is 
in is practice mode. Lizardman does not have a move list, but most of his 
grapple moves are similar to Nightmare's.