can't find achievements that i know the name of in the rs interface. They are confusingly listed and organized under topics like "feats" and "combat" and i think the whole interface could be better , for starters, a search option.
example. i spent 2 hours looking for "gross misconduct" achievement and still can't find it.
If you check on the wiki, you can see catergory, subcategory and subsubcategory, here for instance Lore > Post-Quest > Combat (Post-Quest).
It is a requirement for the completionist cape also, you can simply click on the achievement in the list of prerequisites for the completionist cape to go directly to it.
That being said, I agree a search option wouldn't hurt.
Saryk