Kill 100 enemies by kicking them off the rooftops/cliffs.

Save 15 survivors from zombies

Open 5 GRE chests in Quarantine Zones

Get 15 Relief Packages

Add a fire elemental effect to a sword or a khopesh

Survive night pursuit of level two or higher

Score 10 headshots on Rais's men with a bow

Reach Agility Prof. Lvl 10

Stick a burning zombie on spikes

Win 7 coop competitions

Complete the game on Expert

Complete 5 quests in a single co-op game with the same 3 partners

Run (move or sprint) at least 42,195 m