DnD 5th Edition Compendium

The compendium only shows Acolyte for the backgrounds section

This issue comes up quite often. The Compendium can only contain information released in the System Resource Document by Wizards of the Coast. A great deal of character options have not been released to the SRD, such as most feats, backgrounds and character archetypes. To release the complete contents of the PHB would require a license, which Wizards has been reticent to grant.