The Big Balloon achievement is one of the achievements in the mobile game Honkai Impact: Astrodome Railroad. Let’s take a look at the specific method below!
Answer: Go to Caimeng Avenue and complete the dialogue with the NPC to obtain it;
1. First go to Caimeng Avenue, the location of the transfer point in the picture below.
2. After moving forward, turn left and find the NPC in the picture below to have a conversation.
3. Complete the conversation and you will get the big balloon achievement.
The above is all about how to achieve the huge balloon achievement in "Honkai Impact: Star Rail". For more game guides, please click on the source code website.