Grim Adventures of Billy & Mandy, The (GameCube)
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1st Set Costumes
Complete the Story mode with any character to unlock an outfit for them.
Unlock Boogey
In Mission Mode beat Mission 9 in "Tier 4".
Unlock Chicken
Beat Story Mode with all characters on any difficulty with 10 hours of gameplay.
Unlock Dracula
In Mission Mode beat Mission 5 in "Tier 3".
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 General Skarr
In Mission Mode beat Mission 6 in "Tier 4".
Unlock Hoss Delgado
Beat Mission 9 in Tier 1 in "Mission Mode".
Unlock Jack O'Lantern
In Mission Mode beat Mission 9 in "Tier 2".
Unlock Lord Pain
Complete Mission 9 in Tier 5.
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.
Unlock Nergal Jr.
In Mission Mode beat Mission 9 in "Tier 3".
Unlock Nerglings
Beat Story Mode with all characters on any difficulty.
Unlock Vikings
Beat Story Mode with all characters and destroy every letter in the credits sequence.