OMG BFF FTW

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OMG BFF FTW is an achievement in Halo Wars that is unlocked when the player completes the entire Campaign on Co-Op. This can be done on any difficulty, and it does not all have to be done at once, and not on the same difficulty. Just complete all missions Co-Op.

The name of this achievement was obviously inspired by common slang terms used on the internet. When spelled out, it becomes "Oh My God - Best Friends Forever - For The Win".