Unlockable - Unlocking Slipknot and Chimaira |
| Slipknot 0 | Mission 5: Kill one zombie by the slipknot sign. |
| Slipknot 1 | Mission 7: Kill one zombie by the slipknot sign. |
| Slipknot 2 | Mission 10: Kill one zombie by the slipknot sign. |
| Slipknot 3 | Mission 13: Kill one zombie by the slipknot sign. |
| Slipknot 4 | Mission 16: Kill one zombie by the slipknot sign. |
| Slipknot 5 | Mission 20: Kill one zombie by the slipknot sign. |
| Slipknot 6 | Mission 23: Kill one zombie by the slipknot sign. |
| Slipknot 7 | Mission 26: Kill one zombie by the slipknot sign. |
| Slipknot 8 | Mission 31: Kill one zombie by the slipknot sign. |
| Chimaira | Mission 29: Kill one zombie by the chimaira sign. |
