In Genshin Impact, "Light on the Lake" sounds like an achievement tied to a specific place or event. However, the version number of "Genshin Impact" usually increases in the form of 1.x, and there is currently no version 5.0. Therefore, "5.0" here may be an informal designation for a specific update or event. Here are some possible explanations and ways to accomplish it:
Answer: This achievement can be unlocked by witnessing the completion of the training ground of Flowing Fountains.
1. First go to the transfer point on the east side of the Flowing Spring Tribe, and move to the west to receive the world mission.
2. Accept the mission, follow the guidance to drive away the nearby floating birds, and pick up the shiny shell*1 on the springboard.
3. Adjust the time to the next day, complete the training and continue the conversation, and get a shiny shell*1 and an ordinary treasure chest*1.
4. Then go to the high anchor point, continue to get a shiny shell here, and place the shell at the designated location.
5. Finally return to the training ground to talk and complete the challenge, you can unlock the achievement and get a treasure box.
The above is all about how to achieve the Light on the Lake achievement in "Genshin Impact" 5.0. For more game guides, please click on the source code website.