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Halo: The Master Chief Collection has 700 achievements to unlock and I've only been able to unlock nearly 200 of them.

There's 6 games in the collection. Halo: Reach, Halo: Combat Evolved, Halo 2, Halo 3, Halo 3: ODST, and Halo 4. There's about 100 achievements per game in a combination of single player and multiplayer, and each game includes completing every campaign mission on LASO (Legendary All Skulls On) difficulty. So Legendary difficulty with every skull (modifier) enabled that changes the gameplay drastically.

This includes the INFAMOUS Halo 2 LASO run. One of the most near impossible feats to accomplish in gaming. And it's just 1 achievement out of 700.