|Hard to Kill||20|
|Complete CO-OP Assault level 1, 2 or 3 without either player dying|
I recommend you choose a friend who can play coop, meaning he or she doesn't rush like a berserker obsessed with getting the highest kill count. You will face large waves of aliens and you have to conserve ammo. Talk about who should loot the corpses, as you can't give health packs or ammo to the other player. Walk slowly and keep close so that you can protect each other.
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