Acheivment system (Marvel)

Alex gets a system that gives him rewards based on achievement, and it sends him to Marvel while he as to protects the timeline from aberrations or beings/power who are not supposed to be here I'm going to take this fic slowly to make sure i don't forget anything while also trying to improve the quality. *I do not own the cover design, and if I come across something better, I will change it. If you find one that's better, that would help*