The Collapsed Star Railroad Goodbye Comet Hunter is a hidden achievement that requires collecting three Comet Hunter letters in the mission Out of Reach. The following is a guide for you to achieve the Collapsed Star Dome Railway and Goodbye Comet Hunter achievement. I hope it will be helpful to you.
1. First, at level 20, access the unreachable mission at the blue exclamation mark on the black tower support cabin map. After reaching the position shown in Figure 1, adjust the control device to blue.
2. Then go all the way to the left and turn on the innermost controller in Figure 2, then return to the position in Figure 1 and adjust the control device to red.
3. Go to the position in Figure 3 and turn on the control device until it turns blue to talk to the NPC. Then just follow the plot. Don’t leave in a hurry after completing the task.
4. After talking to the three paper cranes in Figure 4, you can obtain the achievement. The specific location is as shown in the figure.
