Glitches
Weapon Duplication
Only works on items that you can throw and then pick up again. Throw an item (melee weapons, throwing knives), then while the item is still in the air, hit select and go to your inventory. Unequip the item that you threw, then leave the inventory menu and pick up the item. You should now have 2 identical copies of the item. Does not work for guns (they can't be thrown), or bombs/molotov cocktails (they explode on contact and as such cannot be picked back up). Also, if you are using Logan and have his boomerang skill, if the skill procs while you are attempting to do this the duplication will fail, because there is nothing for you to pick up.
Trophies
There are 20 Bronze Trophies, 11 Silver Trophies, 4 Gold Trophies, and 1 Platinum Trophy.
- Silver - Achiever - Finish all quests in the game
- Gold - At Your Service - Rescue 20 NPCs that have been grabbed by monsters
- Bronze - Better than the arm - Kill 25 monsters with a chainsaw
- Silver - BrainLess - Kill 50 monsters by smashing, decapitating or shooting them in the head
- Bronze - Breaching the Tunnels - Successfully defend the tunnel entrance
- Bronze - Bully - Kill 100 monsters with a kick
- Bronze - Combat on the roof - Survive the horde on the roof
- Bronze - Defeat Harlow - Defeat Harlow
- Bronze - Dream Team - Complete all the main quests cooperatively with any number of partners
- Bronze - First Do No Harm - Finish hospital quests for Cecil
- Silver - Heart of Darkness - Find a boat for use in the jungle
- Bronze - Henderson Town - Reach Henderson
- Bronze - Hunter-Seeker - Find and kill all named champion monsters located in dead zones
- Gold - Hurler - Kill 100 monsters with thrown melee weapons
- Bronze - It's an Order - Mark 100 opponents which were then killed by your co-op partners
- Bronze - Jetboat - Kill 100 monsters using the boat's speed boost
- Gold - Juggernaut - Kill 100 enemies using charge attacks
- Bronze - King among Kings - Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.
- Silver - Meeting Serpo - Make pact with Serpo
- Bronze - Military Base - Gain access to a long-range radio station
- Silver - Mystery solved - Find all the secret files
- Bronze - News junkie - Find all the volunteer's voice recordings
- Silver - Obtain level 50 - Obtain level 50
- Silver - Obtain level 70 - Obtain level 70
- Gold - Professional Tourist - Find all pages from the guide book
- Silver - Serving Science - Finish quests for Dr. Kessler
- Silver - Siege Hammer - Install a total of 5 barricades during hub defense
- Bronze - The Cinema - Clear out the cinema
- Bronze - The Collector - Find 50% of collectibles
- Bronze - The Docks - Enter the docks in Quarantine Zone
- Bronze - The Hoarder - Find all collectibles
- Silver - The Hurt Mine Locker - Kill 10 monsters with one mine
- Bronze - The Storm - Escape from the ship
- Bronze - The Whole World Went Away - Collect all other trophies
- Platinum - Twins - Kill the Twins
- Silver - You've tricked me once - Finish the game
