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Dungeon Crawler
Fragment of a discussion from Talk:Journal
That should be good enough, have you tried making a check off list, writing down each and every dungeon and arena, then visiting them one by one checking it off as you go? You may have missed one and not noticed. After you try that and if you still don't have the achievement, you can send Nexon a ticket on their website and they'd hopefully fix it. (Also, I'm pretty sure Hardmode dungeons don't count, but I may be wrong.)