Left 4 dead achivment (finishing no mercy campaign)

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PSfanboy101

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#1 PSfanboy101
Member since 2008 • 1734 Posts
okay so when i first started playing the single player campain i didnt know how to save so every time i finished a chapter i would quit then when i felt like playing again i just selected chapter 2 just about 5 mins ago i selected the last chapter and finished the campaign but i didnt get the achvemnt...whats going on?
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kev14721

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#2 kev14721
Member since 2007 • 258 Posts
you need to do the entire campaign in one go to get the achievements
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Tristan2668

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#3 Tristan2668
Member since 2008 • 43 Posts

you need to do the entire campaign in one go to get the achievements kev14721

Yup. It takes less than 45 minutes though (takes me an average of 35 mins) so you can get the achievement really quick.