Loop through all custom taxonomy terms for a post type

gistfile1.php

<?php
            $post_type = 'post';
            // Get all the taxonomies for this post type
            $taxonomies = get_object_taxonomies( (object) array( 'post_type' => $post_type ) );
            foreach( $taxonomies as $taxonomy ){
                // Gets every "category" (term) in this taxonomy to get the respective posts
                $terms = get_terms( $taxonomy );
                foreach( $terms as $term ){
                    echo $term->name;
                }
            }