Trim excess fat from the pork shoulder and cut it into large pieces.
Mix the salt, black pepper, chili powder, cumin, paprika, garlic powder, and onion powder until combined.
Rub the spice mixture all over the pork pieces.
Layer sliced onion and minced garlic in a slow cooker, then top with seasoned pork.
Pour the chicken broth and orange juice over the pork.
Cook on low for 8 hours until pork is tender and shreds easily.
Remove the pork from the slow cooker and shred it using two forks. Return the shredded pork to the slow cooker and stir it into the juices if desired.
Warm tortillas in a skillet or microwave until soft.
Fill each tortilla with shredded pork. Add your favorite toppings and enjoy.