EXTRA: Space Dude 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. The map is a little annoying to navigate, but at some point it goes away and you're just freely roaming around the cosmos. Stick to the usual weapons and items to survive for 20 minutes (Santa Water, Axes, King Bible, etc., and Spinach Leaf, Candelabra, Spell Binder, etc.), and once you hit the 20-minute mark (assuming you've also grabbed Brave Story at 18 minutes for EXTRA: Brave Story (5G)), go ahead and end the run to unlock this.