You can sometimes "unblock" the wiki by pasting the URL into Google Translate, selecting a different "to" language, and clicking the generated link to view the page through Google's servers.
If you only need a quick refresher on progression without browsing the full wiki, follow these standard milestones: terraria wiki unblocked link
This includes major mods like Calamity and Thorium, which have their own dedicated sections on the wiki.gg platform. You can sometimes "unblock" the wiki by pasting