<p>They disappear but u save your achievments.</p><p>One guy on Antica have comment:</p><blockquote><p>Hacked and rooked to level 3 on 14-03-2016. Lost ferumbras hat, But still have Alumni achievement. - Hekslord</p></blockquote><p>As we can see he have highlighted achievement Aluani on <strong>Alumni </strong>on website. :)</p>