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Mystery Achievement

Inscrutable. Mysterious.

Mystery Achievement0
6 guides
16 Nov 2014 18 Nov 2014
50 3 0

From the main menu select "Multiplayer" then "Custom Games". Now select "Halo CE", and then select any map. While on the Game type tab, click in the right stick, select "Save As", and name the file ".fortune" and enter. When you do this, you will get an error message within Halo MCC, and the achievement will unlock.