13 achievements for 1000 Gamerscore
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Flying Blind
Finish a stage with the crosshair off
50 Gamerscore
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Bow to me
Attain 5 stars on all story stages
200 Gamerscore
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No cat left behind
Complete the final stage and story mode
100 Gamerscore
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Blistered Feet
Complete Marathon mode
100 Gamerscore
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A Survivor is Born
Reach wave 10 in Survivor Mode
100 Gamerscore
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Insert Coin
Complete your first level
50 Gamerscore
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99 Problems and a Zombie Ain't One
Reach a combo of 99 kills in any mode
50 Gamerscore
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Can't Touch This
Finish a stage without taking any damage
50 Gamerscore
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Pound Cake
Kill 10 enemies with one sledgehammer power-up
50 Gamerscore
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Pacifist
Finish a stage without killing a single enemy
50 Gamerscore
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On Rails
Finish a stage without ever changing lanes
50 Gamerscore
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Airborne Appendages
Get 20 projectile kills in a single stage
50 Gamerscore
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Half Marathon
Reach Stage 2-5 in Marathon Mode
100 Gamerscore