Grim Adventures of Billy & Mandy, The (PlayStation 2)
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Alternate costumes
Successfully complete Story mode with any character to unlock an alternate costume for that person.
Play as Chicken
Successfully complete Story mode with all characters and accumulate 10 hours of game play time to unlock Chicken.
Play as Nerglings
Successfully complete Story mode with all characters to unlock Nerglings.
Play as Vikings
Successfully complete Story mode with all characters and destroy every letter in the credits sequence to unlock Vikings.
Unlock Eris
Beat Story Mode once with either Billy, Mandy, Grim, Or Irwin.
Unlock Fred Fredburger
Beat Story Mode once with either Billy, Mandy, Grim, Or Irwin.
Unlock Hoss Delgado
Beat Mission 9 in Tier 1 in Mission Mode.
Unlock Mogar
Beat Story Mode once with either Billy, Mandy, Grim, Or Irwin.
Unlock Nergal
Beat Story Mode once with either Billy, Mandy, Grim, Or Irwin.