EXTRA: Brave Story Achievement in Vampire Survivors

Refer to EXTRA: Space 54 (5G) for unlocking this new map. Once you have it, simply start a run on it with Sigma, and preferably turn on Hurry mode to speed this up. Survive until 18 minutes on the clock, and then a green arrow will appear on the HUD directing you to the Brave Story relic. By this point, the map will be gone and you'll be able to freely roam around the open area, making navigating to this relic easy. Just head to it and grab it to unlock this achievement, and then stick it out for another minute or two for EXTRA: Space Dude (5G) before ending your run.