Game Achievements:

• A Week To Live - Complete 7 days in any game mode without dying (25 Gamerpoints)
• Anniversary of the dead - Complete the Final Day, in either Single or Multiplayer, and finish the game (45 Gamerpoints)
• Can't Touch This - Rack up a 100x multiplier in any game mode (20 Gamerpoints)
• Environmental Awareness - Kill a zombie using an environmental hazard in any game mode (5 Gamerpoints)
• Friends in Low Places - Save 25 survivors in any game mode (20 Gamerpoints)
• Gas Powered - Complete an entire arena, getting every kill with the Chainsaw (5 Gamerpoints)
• Gun Shop - Kill at least one zombie with each weapon type in any game mode (5 Gamerpoints)
• Hotter Than Hell - Complete the final day of the "7 Days of Hell" unlockable mode (25 Gamerpoints)
• Interior Decorator - Kill 25 zombies in any game mode using environmental hazards (20 Gamerpoints)
• More the Merrier - Kill 10 or more zombies at the same time in any game mode (10 Gamerpoints)
• Socialite - Play in an online multiplayer game (5 Gamerpoints)
• Tour of the City - Complete each arena at least once in the same game in any game mode (15 Gamerpoints)