The Atahualpa theme for WordPress is a really powerful theme with lots of settings. But it doesn’t give you full control over the titles of posts and pages the way the Headspace plugin does.
How the titles of your blog posts look like is important for search engine optimization. If you want your post to be higher ranked in the search result (and who doesn’t?) the title is one of the most important factors to consider.
The Atahualpa theme and the Headspace plugin doesn’t work together without a minor modification to one of the helper php-files in Atahualpa. Look in the functions directory of the theme for the file called bfa_meta_tags.php. Open it in an editor and look for the line that says:

<title><?php bloginfo('name'); ?> <?php wp_title(); ?></title>

Change it to:

<title><?php wp_title(''); ?></title>

Now you can enable the Headspace plugin and go to Settings -> Headspace and define exactly how your titles should be generated.