Can I display all token values available for my Drupal installation?
To see all the value a token would get, you should call the function that replaces a token with its value, passing a different value for its $object parameter.
Using pseudo-code, this is the code you should run:

foreach (get_all_nodes() as $node) {
  print token_replace("[termalias-raw]", 'node', $node);
}


"[termalias-raw]" is a token implemented by the Pathauto module that is associated with node objects.
This is the code contained in pathauto_token_list(), which is the function that lists all the token implemented by a module:

if ($type == 'node' || $type == 'all') {
  $tokens['node']['termpath'] = t('As [term], but including its supercategories separated by /.');
  $tokens['node']['termpath-raw'] = t('As [term-raw], but including its supercategories separated by /.');
  $tokens['node']['termalias'] = t('The URL alias of the taxonomy term.');
  $tokens['node']['termalias-raw'] = t('The URL alias of the taxonomy term.');
}


If you meant the list of all the tokens available, then that list is already given by the Pathauto module in the form that allows you to set the path alias for each entity supported by the module. To see it all you need to check each of the path alias types (e.g. user, node, taxonomy terms).