Tags have been a long-standing issue on Accompl.sh - they were hidden, often broken, and there was no real way to navigate among them.
They’re gone now.
Tags have been replaced with a stricter category structure that will allow for a much better browse experience. You can add categories straight from your list page.

There are a few categories to start and I’ll be adding more as I take suggestions and/or see the need pop up.
With these new categories come new ways for you to browse through what people have added: Explore Categories. This new data will also allow me to do cooler things within your list like show what types of goals you’re working on (perhaps you’re a fitness buff with 10 goals categorized as Health & Fitness) and also suggest goals and other members to you based on your common categories. Hopefully that’ll come soon!
Have an idea for a category that’s not included in this first list? Let me know in the comments!