Acquire best wpn through standard reinfrc.

Play with 10 different co-op partners for at least 15 minutes each.

Clear a mission without taking damage

Defeat 1000 enemies in Scenario Campaign Mode.

Survive 10 consecutive waves using only custom weapons.

On Hardened or Veteran difficulty, complete a level without dying. (Solo only)

Kill 500 enemies with any rifle, repeater, or shotgun in any game mode.

Earn $10,000 in Single Player.

Reach "The Dark Lord" ending.

Kill the last buffalo in the Great Plains in Single Player.

Use every type of firearm on a zombie

Collect all Guns

Shoot all of Amsel's henchmen, including their attack dog, without reloading. (Solo only)