Add Meta tags and Title on hook_menu "page callback"
Assuming Drupal 7...

For the title you can use drupal_set_title(). 

For the meta tags you can use drupal_add_html_head(). Example from geerlingguy in the comments of those docs:

$element = array(
  '#tag' =&gt; 'link', // The #tag is the html tag - &lt;link /&gt;
  '#attributes' =&gt; array( // Set up an array of attributes inside the tag
    'href' =&gt; 'http://fonts.googleapis.com/css?family=Cardo&amp;subset=latin', 
    'rel' =&gt; 'stylesheet',
    'type' =&gt; 'text/css',
  ),
);
drupal_add_html_head($element, 'google_font_cardo');