Completing the conditions for certain medals will unlock characters. These characters can be used in survival modes and have different stats, however these differences do not carry over if they are used in story mode.
| Character | How to unlock
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|---|
| - Buy everything in survival mode.
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| - Survive 15 consecutive waves.
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| - Kill an enemy with a sink.
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| - Perform 60 pistol counter kills.
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| - Kill a goon by throwing a bomber.
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| - Perform 100 turret kills.
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| - Complete campaign on hard.
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| - Complete all waves of a survival map.
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| - Reach the zombie wave in each survival map.
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| - Perform 50 fire trap kills.
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| - Execute 100 grenade kills.
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| - Complete campaign on normal.
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| - Perform 20 bat counter kills.
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| - Purchase an item in survival mode.
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On the character select screen of Survival Mode, move your cursor in the following order: Up, Up, Down, Down, Left, Right, Left, Right. A character box should immediately appear on the bottom left corner of the select screen.
Complete the following achievements to unlock Xbox Live Gamerscore points.
| Achievement | How to unlock
|
|---|
- And the Kitchen Sink ( 5 points )
| - Find the kitchen sink and kill someone with it.
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| - Execute 150 kills with the baseball bat.
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| - Do 10 combos of 20 hits or more.
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- Ditch Digger ( 5 points )
| - Kill 100 enemies using the shovel.
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- Freedom Fighter ( 5 points )
| - Rescue 50 Civilians From The Militia.
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- Gimmick Free ( 10 points )
| - Kill a Survival Boss with no traps or grenades.
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- No Bargains ( 10 points )
| - Buy nothing for 10 straight waves of Survival.
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| - Do 30 counters in one Survival match.
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- Pistol Heimlich ( 15 points )
| - Perform 60 Pistol Counter Kills.
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| - Kill 50 enemies with the heavy object smash.
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| - Buy everything in Survival Mode.
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| - Stay alive for 15 consecutive Survival waves.
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- That Is Gonna Leave A Mark ( 15 points )
| - Perform 100 Machete Counter Kills.
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- The First Dozen ( 5 points )
| |
- The Story Ends ( 15 points )
| - Complete Campaign Mode on Normal difficulty.
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| - Complete Campaign Mode on Hard difficulty.
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- Trigger Happy ( 15 points )
| - Get 30 firetrap kills in one Survival match.
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- Ultimate Survivalist ( 20 points )
| - Defeat all the waves in any Survival map.
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- Up Close and Personal ( 10 points )
| - Beat a Campaign level with no ranged attacks.
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- Zombie Killer ( 10 points )
| - Reach the zombie wave in each Survival map.
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