Kill 50 monsters by smashing, decapitating or shooting them in the head
Obtain level 50
Finish all quests in the game
Find all the secret files
Obtain level 70
Install a total of 5 barricades during hub defense
Complete all the main quests cooperatively with any number of partners
Find 50% of collectibles
Find all collectibles
Find all pages from the guide book
Kill the Twins
Find all the volunteer's voice recordings
Rescue 20 NPCs that have been grabbed by monsters
Kill 10 monsters with one mine
Kill 100 monsters with thrown melee weapons
Kill 100 monsters with a kick
Kill 100 monsters using the boat's speed boost
Kill 100 enemies using charge attacks
Kill 25 monsters with a chainsaw
Mark 100 opponents which were then killed by your co-op partners
Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.
Find and kill all named champion monsters located in dead zones
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