I'm looking to do the "You Complete Me" rewards mission, but..

Only the games listed in the terms of the offer are eligible. Monster Hunter is not.

Level 1: Cherish the Bonds of Bro-ship

You must spend at least $50 before tax on eligible games for Xbox One and Xbox 360. This offer does not apply to purchases made in the retail Microsoft Store. Digital Games must be purchased in the Microsoft Store on your Xbox or on Windows and be from this
list of approved titles: Battleborn, Battlefield 1, Battlefield 3, Battlefield 4, Battlefield Bad Company 2, Battlefield, Hardline, Bulletstorm, Call of Duty: Advanced Warfare, Call of Duty: Black Ops, Call of Duty: Black Ops III, Call of Duty: Ghosts, Call
of Duty: Infinite Warfare, Call of Duty: Modern Warfare , Call of Duty: WWII, Destiny, Destiny 2, Destiny: The Taken King , Diablo III, Diablo III: Reaper of Souls, EA Sports NHL 18, FIFA 18, Gears of War, Gears of War 2, Gears of War 3, Gears of War 4, Gears
of War: Judgment, Halo Wars, Halo Wars 2, Halo Wars 2: Awakening the Nightmare, Halo 3, Halo 4, Halo 5: Guardians, Halo: Reach, Madden NFL 18, NBA 2K18, NBA Live 18, Overwatch, Rocket League, Titanfall, Titanfall 2, WWE 2K18

If you need further assistance with the offer, you'll need to post in the Xbox Rewards Questions support forum.

Complete a mission that states you will receive a reward.

I love these missions when they come out. I've completed everything except for the 2 that require 3 weeks of mobile searches and 3 weeks of console missions completed, but cosmic rescue has seemingly vanished from Rewards on my computer and on the console.
Looking forward to getting another month of game pass and x2 rewards!

You could also complete reward missions if you have the gamepass some missions give 600 reward points you can typically earn over 2000 reward points every month hope this helps

You'll want to contact Rewards support via the contact link at the very bottom of the Rewards site.