print all wp_actions:

function print_all_wp_actions() {
	global $wp_actions;
	echo 'all WordPress actions: <pre_>';
	print_r( $wp_actions );
	echo '</pre_>';
}

print all wp_filters:

function print_all_wp_filters() {
	global $wp_filter;
	echo 'all WordPress filters: <pre_>';
	print_r( $wp_filter );
	echo '</pre_>';
}

All WordPress actions:

Array
(
    [muplugins_loaded] => 1
    [registered_taxonomy] => 10
    [registered_post_type] => 10
    [plugins_loaded] => 1
    [sanitize_comment_cookies] => 1
    [setup_theme] => 1
    [load_textdomain] => 3
    [after_setup_theme] => 1
    [auth_cookie_malformed] => 1
    [auth_cookie_valid] => 1
    [set_current_user] => 1
    [init] => 1
    [widgets_init] => 1
    [register_sidebar] => 1
    [wp_register_sidebar_widget] => 12
    [wp_default_scripts] => 1
    [wp_default_styles] => 1
    [admin_bar_init] => 1
    [add_admin_bar_menus] => 1
    [wp_loaded] => 1
    [parse_request] => 1
    [send_headers] => 1
    [parse_query] => 2
    [pre_get_posts] => 2
    [posts_selection] => 2
    [wp] => 1
    [template_redirect] => 1
    [get_header] => 1
    [wp_head] => 1
    [wp_enqueue_scripts] => 1
    [wp_print_styles] => 1
    [wp_print_scripts] => 1
    [before] => 1
    [loop_start] => 2
    [the_post] => 7
    [get_template_part_content] => 3
    [loop_end] => 2
    [get_sidebar] => 1
    [before_sidebar] => 1
    [dynamic_sidebar] => 4
    [pre_get_comments] => 1
    [get_footer] => 1
    [_s_credits] => 1
    [wp_footer] => 1
    [wp_print_footer_scripts] => 1
    [admin_bar_menu] => 1
    [wp_before_admin_bar_render] => 1
    [wp_after_admin_bar_render] => 1
)