10 achievements for 1000 Gamerscore
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Joining Their Ranks
You died.
50 Gamerscore
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Surviving the Onslaught
Cleared Onslaught Mode
100 Gamerscore
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A Little Too Easy
Cleared Story Mode on Easy Difficulty or Higher
50 Gamerscore
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Perfectly Normal
Cleared Story Mode on Normal Difficulty or Higher
100 Gamerscore
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Biohazard Containment
Cleared Story Mode on Biohazard Difficulty or Higher
100 Gamerscore
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True Nightmare
Cleared Story Mode on Nightmare Difficulty or Arrange Mode
150 Gamerscore
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Kill Them First
Defeated a Zombie
50 Gamerscore
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Taking Down the Horde
Defeated a Reptile
100 Gamerscore
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Never Surrender
Defeated an Enforcer
150 Gamerscore
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They're More Afraid of You
Defeated a Brute
150 Gamerscore