Create page template with this code :
$args = array(
'post_type' => 'attachment',
'posts_per_page' => -1
);
$query = new WP_Query( $args);
if($query->have_posts()){ //check if found any attachment
while($query->have_posts()){ //loop
$query->the_post();
//you can add your code here
}
}else{
// if found NO posts
}