In "Honkai Impact: Star Rail", the specific ways to achieve the achievement "The Worst Nameless Guest" are as follows:
Answer: We only need to bring the memory bubbles of two unknown guests with Pam to unlock the achievement.
1. First of all, we need two memory bubbles of unknown guests to do this task.
2. We first teleport to the train observation compartment and find NPC Pam.
3. If the player talks to Pam for the first time today, a random small task will appear. We need to complete the task before continuing.
4. After completing the random little characters, we returned to the carriage and continued talking to Pam.
5. In the dialogue, we choose the branch "Look at this dream bubble".
6. We will then proceed to a plot.
7. After completing the plot dialogue, we can unlock the achievement "The Worst Nameless Guest".
The above is all about how to achieve the worst achievement of the Nameless Guest in "Honkai Impact: Star Rail". For more game guides, please click on the source code website.