The Fyxestroll Garden area in Honkai: Star Rail houses various secret stories told both by the bystanders or by those scary Heliobus lying around. One of them grants you the Boo Ha Ha! Hidden Achievement, and here’s how you can get this one.
How to Unlock the Boo Ha Ha! Achievement in Honkai: Star Rail
The Boo Ha Ha! hidden achievement in The Memories We Share section is unlocked by visiting the Little Ghost in all of its appearing areas in order in the Fyxestroll Garden. You probably have already started this side quest by accident as you explored the area for the first time, but there are some big chances you missed some of the encounters. Below are all of the locations.
The first encounter will trigger after taking the stone elevator for the first time after completing the Sojourners’ Ghastly Reverie Trailblaze Continuation mission (Guinaifen and Huohuo’s first quest). Speak with the Little Ghost here and hold to its gift in your inventory.
Now head back to the Space Anchor at the entrance, turn back, and speak with the little spirit located here. It should be indicated with a “?” symbol in its interaction box.
Now head to the third location next to the Suppression Tower, and a piece of dialogue should be automatically triggered as soon as you approach the spirits. Get closer to trigger the full event.
Now, keep heading for the next one and speak with the teapots here. Any option is fine and will advance the mini-quest to its final step.
Finally, head to the Locufox Forest Backdoor Space Anchor, and you’ll see the Little Ghost here once again. They’ll gift you all 900 prizes at once instead of making all of the intended 900 puzzles. Hurray! What are the prizes, you may ask? Trash, of course! I mean, it’s literally Trash. A Pleasant-Looking Trash, to be exact. Oh, but you also unlock the Boo Ha Ha! achievement here, at least.
As I mentioned before, chances are that you’re already halfway through this quest, especially if you had to look for someone who knows about music at an earlier moment, so it won’t be a hassle to complete it after a few more interactions. And an extra achievement is always welcome, so enjoy it!