remove-archive-title.php

/**
 * Removes the "Archive" prepending category and custom post type archives
 * @author Reid Burnett
 */
add_filter( 'get_the_archive_title', function ($title) {
    if ( is_category() ) {
            $title = single_cat_title( '', false );
        } elseif ( is_tag() ) {
            $title = single_tag_title( '', false );
        }
    if( is_post_type_archive() ) {
        $title = sprintf( __( '%s' ), post_type_archive_title( '', false ) );
    }
    return $title;
});