0.09%
Ballistic Backfire
Complete all missions in Operation B with the Pacifist Skull active
0.09%
Outer Shell
Complete all missions in Operation C with the Hollow Skull active
0.09%
Running Low
Complete all missions in Operation E with the Famine Skull active
0.09%
Dark Clouds
Complete all missions in Operation F with the Thunderstorm Skull active
0.17%
Melee Madness
Complete all missions in Operation A with the Black Eye Skull active
0.26%
Wild Guess
Complete all missions in Operation D with the Blind Skull active
1.31%
Extermination
Kill 10,000 enemies in co-op
1.39%
Overachiever
Earn all co-op medals at least once
1.48%
The Company of Strangers
Complete a co-op mission with at least 5 different players
1.65%
The Enemy of my Friend
Get a higher individual score than your partner on all co-op missions
1.65%
Dynamic Duo
Earn all Gold stars in all co-op missions
2.40%
A for Effort
Complete all Operation F mission challenges