In a large, deep skillet fry the bacon over medium-high heat. Drain the fat, add the onions to the pan and cook until onions are translucent. Stir in the shrimp and chipotle chiles, cook 4 minutes or until heated through. Add adobo sauce.
Heat tortillas on un-greased skillet over medium-high heat for 10-15 seconds. Turn over and heat another 5-10 seconds. Assemble tacos.