One of his biggest accomplishments comes from All-New, All-Different Avengerswhere Miles takes a heat blast strong enough to melt Iron Man's armor, but left the young hero still standing.

Source: https://www.cbr.com/spiderman-multiverse-greatest-achievement/

The most successful of the new heroes launched from was Ms. Marvel, Kamala Khan, who would go on to join the primary "All-New, All-Different" Avengers squad for a time.

Source: https://screenrant.com/most-underrated-avengers-marvel-comics-history/