The Beeline is this game's fast-travel system, letting you get from one area to another fast and access a few secrets along the way. You can unlock the first of these after freeing Spina in the Boiling Underbelly. Simply head to the upper-left section of the Skullgang hideout and stand next to the little totem thing(it's next to an NPC who says that the line is for members only). Pay 100 fruit when prompted and then use the paddle to launch into the bee-cannon-thing.
swings the cannon left and fires if the cannon is already positioned to the left,
swings the cannon right and fires if the cannon is already positioned to the right, and
sets the cannon to a neutral position and lets you drop if pressed a second time. The achievement will pop sometime during transit.