Drake Hollow

Once you have a St. Elmo's Fire find a group of 10 or more corruption vines that are close together, walk inside and use the ability, it will slowly chain to each vine within distance and burn them. You can do this on any island where you still have vines, if you don't have 10 close together destroy all but 1 vine on an island, more vines will slowly grow around your last vine and you'll be able to try for the achievement once 10 have grown there.

I highly recommend saving before trying this, St Elmo's Fire's aren't exactly easy to come by until you reach the winter biome. If you're having trouble finding garage drippings check the chests you can find at random POI's in the aether (sinking buildings or groups of trees ect), you can also get them as rewards from defeating ambushes or raids too.

There is a really easy way to do this without having to wait 1-2 hours or restarting worlds.

You basically need to find any one vine, place a few waypoints next to eachother in a cramped position. Make sure they all have the vines on them. then make a 2 waypoint line (right next to each other with practically no space) and set the waypoint at the end of the line on fire. The waypoint's vine will burn down, regenerating, and burning forever!

I also found a ambush spawning every time i got near the waypoints (spawned 2-3 at the same time by walking in and out of the area) Ended up grinding alot of gems.