Took quite some time, but I eventually succeeded. ODST was the easiest for me because I'd already gone through that campaign on heroic on 360. The rest were equally difficult for the most part. Combat Evolved was a bit of a bitch because of the library and the flood in general. I might go through Halo 5 on hard, but I struggled with Warden Eternal on normal so I'm kind of hesitant. I also have Reach to go through, but I'll do that with a friend or my brother.
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Me and my cousin were supposed to do that, but he went to prison for drugs 😮