Collect 50 Journals.

Slay 100 Zombies using Caustic, Fire, or Shock damage.

Track down Michael and rescue him from the Terror at Monarch Studios.

Reach maximum respect.

Complete any 5 quests in co-op.

Fight through the Halperin Hotel to make contact with the authorities.

Survive a plane crash, get bitten, and create your first Zombie-Free Zone.

Complete the "Saint Mark's Bistro" mission.

Sneak into the underground base without setting off the alarm above ground during "Black Project".

Reach 6 wanted stars.

Put all your money or the maximum bet on red or black and win.

Complete BMX or NRG challenge.

Find Mike Toreno without any of the referenced locations during "Mike Toreno".