The funny thing about Halo: The Fall of Reach is that the book came years before the game, so Halo: Reach is technically a game based on a book, a whole other can of worms I will probably have to deal with at some point, between this book you mentioned, The Witcher and Metro, probably among many others.
I do have to admit that not acknowledging cross-media stuff is also a pet-peeve of mine. To my knowledge, Halo and Assassin's Creed are mostly up to par with keeping the continuity relatively clean (the games themselves sometimes breaking lore and failed live action projects notwithstanding).