https://www.halowaypoint.com/en-us/community/blog-posts/halo-5-guardians-achievements-revealed
Just saw Halo announce on social media the achievement list. Looks pretty easy for a 100%.
My tentative plan:
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4 player co-op campaign on heroic, day of release. This will knock down most mission achievements, plus I want to focus on story line mostly anyways. I will try to get a bunch of the mission-specific random achievements at this time too, as almost all of them require heroic difficulty. Having 4 live players who are Halo veterans should make this easy.
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Legendary campaign, solo. I do this for every game anyways.
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Play the heck out of the multiplayer. It looks like most achievements will be acquired incidentally without needing to hunt for them anyways.
Can’t wait for this game!!