Accordion shortcode. It uses Builder's default output. Example: [accordion][accordion_item title="Title 1"]Panel 1 content[/accordion_item][accordion_item title="Title 2"]Panel 2 content[/accordion_item][/accordion]

gistfile1.php

<?php

function custom_themify_accordion_shortcode( $atts, $content = '' ) {
	$class = isset( $atts['style'] ) ? $atts['style'] : '';
	$output = '<div class="module module-accordion"><ul class="ui module-accordion '. $class .'">';
	$output .= do_shortcode( $content );
	$output .= '</ul></div>';
	return $output;
}
add_shortcode( 'accordion', 'custom_themify_accordion_shortcode' );

function custom_themify_accordion_item_shortcode( $atts, $content ) {
	$output = '<li><div class="accordion-title"><a href="#">' . $atts['title'] . '</a></div><div class="accordion-content default-closed">'. do_shortcode( $content ) .'</div></li>';
	return $output;
}
add_shortcode( 'accordion_item', 'custom_themify_accordion_item_shortcode' );