There are many achievements related to the plot mission in "Oath" and Ding Cheng is one of them. However, many players do not know how to Ding Cheng do it. First of all, this is the achievement of the "Heroic Heart" of the side plot, and ignore the notes when exploring the dungeon of the Sand Sea ruins.
How to do it if you don't know what you want to know?
Ignorance
Ignore warnings in the sand sea ruins and pull down the pull rod
The side plot "Hero's Heart" achieves, ignoring the note when exploring the dungeon of the Sand Sea ruins and pulling down the pull rod.
