Cub Scouts earn adventures that are specific to their grade and rank. A number of adventures must be completed to earn the badge of rank for each grade level. Adventures may be earned in any order. Completion of adventures is how the aims of character, citizenship, leadership, and personal fitness are developed.
https://www.scouting.org/programs/cub-scouts/what-cub-scouts-earn/cub-scouting-adventures
PDFs with requirements
Webelos/AOL (4th and 5th Grades)
source: usscouts.org