Something like this:
<?php
$args = array (
'post_type' => 'attachment',
'post_status' => 'any',
'posts_per_page' => -1,
'tax_query' => array(
'relation' => 'AND',
array(
'taxonomy' => 'YOUR_TAXONOMY_NAME',
'field' => 'slug',
'terms' => 'YOUR_TAXONOMY_TERM_NAME'
),
array(
'taxonomy' => 'category',
'field' => 'slug',
'terms' => 'YOUR_CATEGORY_NAME'
)
)
);
$the_query = new WP_Query( $args );
if ( $the_query->have_posts() ) :
while ( $the_query->have_posts() ) : $the_query->the_post();
echo wp_get_attachment_image( get_the_ID(), "thumbnail");
endwhile;
endif;
wp_reset_postdata();
?>