Smart Thinking

Smart you indeed. The gods almost gave up hope that anyone would ever figure THAT one out. They smile on you proudly now.

This achievement has no spoiler.

In 2024, Rejana confirmed the achievement is not bugged.
In February 2025, during the Monk Vocation Update Test Server, CipSoft provided characters with certain levels and many quests completed for players to test around. These characters had this achievement unlocked, so it was possible for players to find out its name, description, and grade.