<https://community.supermechs.com/topic/808-guys-i-think-i-figured-out-the-achievement-bug/#comment-7964>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://community.supermechs.com/topic/808-guys-i-think-i-figured-out-the-achievement-bug/>