รหัสผ่านอยู่ในกำมือ

Missing, extremely new, or very obvious to obtain.

This achievement has no cultural references in the English and Chinese versions. Clout is basically influence, power, reputation, or popularity. One's clout benefits from engaging with one's audience, so replying to posts on the Ghostly Grove (as someone who is new to that kind of stuff), makes clout within one's grasp.