Note. This answer was correct at the time of writing. The {{#get}} was added in November 2015 and is available by default with Ghost 1.0 (Aug 2017). This is described here: https://themes.ghost.org/docs/get
David's answer should now be an accepted answer.
A list of all tags is currently not possible, as described in the FAQ . It also refers to getting an auxiliary function in the roadmap that will make this possible in the future.
One of the few hacked features with the current version of Ghost is to use JavaScript to retrieve RSS feed pages and scroll through each page that captures tags from each post. This will work, but it is worth keeping in mind that the RSS feed pagination will disappear in a future version (after the API is fully accessible, therefore there will be a migration path).
Once the helper is released, get will become a simple helper: {{#get 'tags'}}...do things with tags here...{{/get}} . This feature is under active development.
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