Spray 3- to 4-quart slow cooker with cooking spray. Place pork in slow cooker; sprinkle with taco seasoning mix. Cover; cook on Low heat setting 7 to 9 hours or until pork pulls apart easily with fork.
Remove pork from slow cooker; shred pork. Stir into liquid in slow cooker. Stir in pineapple and lime juice.
To serve, divide pork among taco shells (about 1/4 cup each), and top with remaining ingredients.