BadgeOS custom display shortcode

<?php
/**
* Display earned badges for a given user
*
* @param array $atts Our attributes array
* @return string Concatenated markup
*/
function prefix_badgeos_user_achievements_shortcode( $atts = array() ) {

// Parse our attributes
$atts = shortcode_atts( array(
'user' => get_current_user_id(),
'type' => '',
'limit' => 5
), $atts );

$output = '';

// Grab the user's current achievements, without duplicates
$achievements = array_unique( badgeos_get_user_earned_achievement_ids( $atts['user'], $atts['type'] ) );

// Setup a counter
$count = 0;

$output .= '<div class="badgeos-user-badges-wrap">';

// Loop through the achievements
if ( ! empty( $achievements ) ) {
foreach( $achievements as $achievement_id ) {

// If we've hit our limit, quit
if ( $count >= $atts['limit'] ) {
break;
}

// Output our achievement image and title
$output .= '<div class="badgeos-badge-wrap">';
$output .= badgeos_get_achievement_post_thumbnail( $achievement_id );
$output .= '<span class="badgeos-title-wrap">' . get_the_title( $achievement_id ) . '</span>';
$output .= '</div>';

// Increase our counter
$count++;
}
}
$output .= '</div>';

return $output;
}
add_shortcode( 'custom_badgeos_user_achievements', 'prefix_badgeos_user_achievements_shortcode' );