Achievements
     Complete each achievement to get the allotted gamerscore.

A Week To Live (25):          Complete 7 days in any game mode 
                              without dying

Anniversary of the Dead (45): Complete the Final Day, in either Single 
                              or Multiplayer, and finish the game

Can't Touch This (20):        Rack up a 100x multiplier in any game mode

Environmental Awareness (5):  Kill a zombie using an environmental hazard 
                              in any game mode

Friends in Low Places (20):   Save 25 survivors in any game mode

Gas Powered (5):              Complete an entire arena, 
                              getting every kill with the Chainsaw

Gun Shop (5):                 Kill at least one zombie with each weapon 
                              type in any game mode

Hotter Than Hell (25):        Complete the final day of the "7 Days of 
                              Hell" unlockable mode

Interior Decorator (20):      Kill 25 zombies in any game mode 
                              using environmental hazards

More the Merrier (10):        Kill 10 or more zombies at the same time 
                              in any game mode

Socialite (5):                Play in an online multiplayer game

Tour of the City (15):        Complete each arena at least once 
                              in the same game in any game mode