This is how to get the hidden achievement of the disappearing toilet on the Collapse Star Dome Railway. The guide for the disappearing toilet mission on the Collapse Star Dome Railway shares with players how to trigger and do the hidden toilet quest of the Collapse Star Dome Railway. Come and take a look if you need it. Bar.
How to get the hidden achievement of the missing toilet in the Collapsed Star Dome Railway
Trigger the task here
Just talk to the NPC. If you investigate the toilet, you will be teleported away and there is an achievement.