Zombie Army Trilogy achievements

11.30%
We got this by the ass!
Reach a total shot distance of 50km
12.77%
Burning a hole in your pocket
Loot a Chainsaw Elite's corpse
13.65%
A friend in need
Revive other players 50 times
14.34%
Got the killshot!
Kill 20 Elites in co-op
14.83%
Nine tenths of the law
Investigated a possessed doll and lived to regret it
15.91%
Answer the Devil's call
Answered a phone call from Hell. It was a wrong number
16.50%
Got your back
Kill 50 enemies that are actively attacking other players
16.99%
Taste some of Mama's home cookin', Adolf!
Successfully complete Army of Darkness
17.29%
The head bone's connected to the...oh, wait
Kill 500 Skeletons
17.68%
Broadsword calling Danny Boy
Successfully complete The Keep
17.98%
There's something in the mist!
Successfully complete Forest of Corpses
18.96%
You're so dead, you don't even know it
Complete any Campaign chapter in 4-player co-op at any difficulty level