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// change 'challenge' to your post type

function sort_challenge_archive_query( $query ) {
	if( $query->is_main_query() && !$query->is_feed() && !is_admin()
	  && ( 
	      $query->is_post_type_archive( 'challenge' )
	      # OR is_tax('business')
	     )
	  ) {
		$query->set( 'orderby', 'title' );
		$query->set( 'order', 'ASC' );
		
		#$query->set( 'posts_per_page', 40 );
	}
}
add_action( 'pre_get_posts', 'sort_challenge_archive_query' );