Kill a friend who has resurrected as a zombie. - Zombie Army 4: Dead War
Kill a Suicider with his own explosives. - Zombie Army 4: Dead War
Reach rank 5. - Zombie Army 4: Dead War
2,094/2,456910/1,00038/43
215/10,822150/1,0003/13
116/3,24590/1,1006/61