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Dear Diary...

From Halopedia, the Halo wiki

Dear Diary... is an achievement in Halo: Combat Evolved Anniversary and Halo: The Master Chief Collection. It is unlocked by locating and activating all of the hidden Terminals within the campaign.[1]

In the original game the achievement is worth 50 Gamerscore; in the Master Chief Collection it is only worth 20 points.

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