Unlock Extras
Anthony Stewart Head Interview: Complete Mission 1
Amber Benson Interview: Complete Mission 2
Nicholas Brendan Interview: Complete Mission 3
Robin Sachs Interview: Complete Mission 4
Chaos Bleeds Comic Book: Complete Mission 5
James Marsters Voice Over Session: Complete Mission 6
Anthony Stewart Head Voice Over Session: Complete Mission 7
Amber Benson Voice Over Session: Complete Mission 8
Nicholas Brendon Voice Over Session: Complete Mission 9
Robin Sachs Voice Over Session: Complete Mission 10
Joss Whedon Voice Over Session: Complete Mission 11
Out-Takes: Complete Mission 12

Unlock Multiplayer Arenas
Cemetery: Finish Mission 2 with Slayer rating
Initiative: Finish Mission 8 with Slayer rating
Quarry: Finish Mission 11 with Slayer rating

Unlock Multiplayer Characters
Male Vampire: Finish Mission 1 with Professional rating
Female Vampire: Finish Mission 1 with Slayer rating
Zombie Skeleton: Finish Mission 2 with Professional rating
Zombie Demon: Finish Mission 3 with Professional rating
Tara: Finish Mission 3 with Slayer rating
Bat Beast: Finish Mission 4 with Professional rating
Zombie Devil: Finish Mission 4 with Slayer rating
Materani: Finish Mission 5 with Professional rating
Psycho Patient: Finish Mission 6 with Professional rating
Sid the Dummy: Finish Mission 6 with Slayer rating
S&M Slave: Finish Mission 7 with Professional rating
S&M Mistress: Finish Mission 7 with Slayer rating
Faith: Finish Mission 8 with Professional rating
Zombie Soldier: Finish Mission 9 with Professional rating
Kakistos: Finish Mission 9 with Slayer rating
Abominator: Finish Mission 10 with Professional rating
Chainz: Finish Mission 10 with Slayer rating
Zombie Gorilla: Finish Mission 11 with Professional rating
Joss Whedon: Finish Mission 12 with Professional rating
Chris: Finish Mission 12 with Slayer rating