Complete all the main quests cooperatively with any number of partners
Finish all quests in the game
Rescue 20 NPCs that have been grabbed by monsters
Find all the secret files
Find all collectibles
Find all the volunteer's voice recordings
Find all pages from the guide book
Find and kill all named champion monsters located in dead zones
Finish the game
Kill 10 monsters with one mine
Kill 100 monsters with thrown melee weapons
Kill 100 enemies using charge attacks
Kill 100 monsters using the boat's speed boost
Defeat Harlow
Enter the docks in Quarantine Zone
Make pact with Serpo
Survive the horde on the roof
Kill the Twins
Finish hospital quests for Cecil
Obtain level 70
Kill 100 monsters with a kick
Mark 100 opponents which were then killed by your co-op partners
Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.
Gain access to a long-range radio station
Find 50% of collectibles
Finish quests for Dr. Kessler
Clear out the cinema
Reach Henderson
Successfully defend the tunnel entrance
Install a total of 5 barricades during hub defense
Kill 25 monsters with a chainsaw
Kill 50 monsters by smashing, decapitating or shooting them in the head
Find a boat for use in the jungle
Obtain level 50
Escape from the ship