Succeeded at five difficult Intimidate attempts

Complete all the main quests cooperatively with any number of partners

Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.

Finish the game

Enter the docks in Quarantine Zone

Survive the horde on the roof

Gain access to a long-range radio station

Clear out the cinema

Kill 50 monsters by smashing, decapitating or shooting them in the head

Install a total of 5 barricades during hub defense

Heal yourself with a medkit 100 times.

Complete act IV.

Set 5 enemies on fire and then kill them with explosives.