| Eagle Eye Engagement |
Earn a grade of 'B' or higher on the 'Eagle Eye Engagement' Challenge. |
10 |
| Aerial Assault |
Earn a grade of 'A' or higher on the 'Aerial Assault' Challenge. |
10 |
| Tougher Than Nails |
Earn a grade of 'S' or higher on the 'Tougher Than Nails' Challenge. |
10 |
| Unstable Ground |
Earn a grade of 'A' or higher on the 'Unstable Ground' Challenge. |
10 |
| Undead Attrition |
Earn a grade of 'B' or higher on the 'Undead Attrition' Challenge. |
10 |
| Close Combat Clash |
Earn a grade of 'A' or higher on the 'Close Combat Clash' Challenge. |
10 |
| Living Nightmare |
Earn a grade of 'B' or higher on the 'Living Nightmare' Challenge. |
10 |
| Not so fast |
Kill a Skinny for the first time in Survival mode |
10 |
| There Goes the Hounds |
Kill a Hound for the first time in Survivor mode |
10 |
| Grounded |
Kill a Winged Horror for the first time in Survivor mode |
10 |
| Stone Age Struggle |
Earn a grade of 'S' or higher on the 'Stone Age Struggle' Challenge. |
10 |
| Undead Team Spirit |
Kill a Cheerleader for the first time in Survivor mode |
10 |
| The Fat Zombie Sings |
Kill a Flesh Beast for the first time in Survivor mode |
10 |
| This is my boomstick! |
Earn the shotgun for the first time in Survivor mode |
10 |
| Poor Equipment |
Earn a grade of 'B' or higher on the 'Poor Equipment' Challenge. |
10 |
| Napalm Warfare |
Earn a grade of 'A' or higher on the 'Napalm Warfare' Challenge. |
10 |
| Zombie Slaughter |
Kill 100 Zombies in one game in Survivor mode |
10 |
| Zombie Massacre |
Kill 200 Zombies in one game in Survivor mode |
10 |
| Engineer Prodigy |
Earn a grade of 'B' or higher on the 'Engineer Prodigy' Challenge. |
10 |
| High Tech Horror |
Earn a grade of 'B' or higher on the 'High Tech Horror' Challenge. |
10 |
