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Old 01-14-2013, 11:24 AM   #2
Pain Immortal
 
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Join Date: Jun 2011
Location: Austria
Posts: 135

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Same happend to me, than i did it solo offline with two controllers.. I did it online about 6 times each mission and everytime no achievement, try it with the offline mode, if you got problems ask somebody to help you offline.
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