The achievement "The Stars Shake the Purple Sky" in Honkai Impact: Planet Rail is an achievement related to a specific mission or event. In order to complete this achievement, you need to complete a series of specific tasks or conditions. Here's how it's done in detail:
Answer: Go to the Jingfeng Ship and use the Smart Bird to enter the depths of the docking area.
1. First, we need to open the map and select the teleportation anchor point location on the right side of the 2nd floor area of the Jingfeng Ship.
2. After leaving the transfer point, go straight forward and you can find the Mecha Bird next to the carton for interaction.
3. After that, you need to control the clever bird to fly to the treasure chest on the right, and click to open the treasure chest.
4. Continue to operate the clever bird to fly to the depths of the boat docking area, reach the location of the crowd in front, and pass through this door to unlock the achievement [The boat shakes, the star moves in the purple]
The above is all the content on how to complete the achievements in "Honkai Impact: Planet Rail". For more game guides, please click on the source code website.