Honkai: Star Rail 1.1 update brought tons of new stuff to the game, including new characters, quests, light cones, and much more. In addition to this, new achievements were also added, and one of them is the Coffin Dancer achievement which no one has been able to complete as of now. If you are wondering how you can complete this achievement, you can find all the details below.
How To Complete Coffin Dancer Achievement In Honkai: Star Rail
You can find Coffin Dancer achievement under The Memories We Share section, and its description is "Witness Luocha’s hidden side," and upon completing it, you will be rewarded 5 Stellar Jade. In order to get it, you will have to first complete Luocha Companion Mission, and after that, you will be asked by Jingyan to "investigate the Foursquare Mirror in the Realm-Keeping Commission Chancery."
You can do it by going to Realm-Keeping Commission Chancery in the Exalting Sanctum, and you will find a green board on the left side next to Jingyan. Go near it and interact with it to listen to Luocha's monologue, and once it's over, you will receive the Coffin Dancer achievement as you have successfully "checked the restored recording and listened to Luocha's monologue."