Mystery solved (15 points) - Find all the secret files
Obtain level 50 (30 points) - Obtain level 50
Obtain level 70 (90 points) - Obtain level 70
Siege Hammer (15 points) - Install a total of 5 barricades during hub defense
Dream Team (15 points) - Complete all the main quests cooperatively with any number of partners
The Collector (15 points) - Find 50% of collectibles
The Hoarder (30 points) - Find all collectibles
Professional Tourist (30 points) - Find all pages from the guide book
Twins (30 points) - Kill the Twins
News junkie (30 points) - Find all the volunteer's voice recordings
At Your Service (15 points) - Rescue 20 NPCs that have been grabbed by monsters
The Hurt Mine Locker (15 points) - Kill 10 monsters with one mine
BrainLess (15 points) - Kill 50 monsters by smashing, decapitating or shooting them in the head
Hurler (15 points) - Kill 100 monsters with thrown melee weapons
Bully (15 points) - Kill 100 monsters with a kick
Jetboat (90 points) - Kill 100 monsters using the boat's speed boost
Juggernaut (15 points) - Kill 100 enemies using charge attacks
Better than the arm (30 points) - Kill 25 monsters with a chainsaw
It's an Order (15 points) - Mark 100 opponents which were then killed by your co-op partners
King among Kings (30 points) - Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.
Hunter-Seeker (90 points) - Find and kill all named champion monsters located in dead zones"
#13 secrets/hidden