En una palabra, genial

Missing, extremely new, or very obvious to obtain.

This achievement has no cultural references in the English and Chinese versions. It is likely specific to the game. As said in game after investigating all manhole covers, "They're cool, and... They're very cool." However, the Japanese title of the achievement, とにかくカッコいい (Tonikaku Kakkoi), is a reference to the romcom manga トニカクカワイイ (Tonikaku Kawaii), which can be translated into "Anyway, It's Cute". - Credits: nahere_