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For whatever reason I dont have the super sleuth achievement in ODST. To get it you need to "find the final clue unraveling the mystery" meaning you need to basicly complete the campaign. I have completed it on every level. Why dont I have it???
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You have to complete every flashback mission (i.e. Tayari Plaza to Kikowani Station) and start the Data Hive mission in a single save session (saving and quitting is okay; selecting "Replay Mission" in the campaign lobby is not).