Rub the pork shoulder with cumin, dried oregano, garlic powder, sea salt, and black pepper.
Place the seasoned pork in a slow cooker and cook on low for 8 hours or high for 4-5 hours until tender.
Once cooked, shred the pork using two forks.
Heat the avocado oil in a large skillet over medium-high heat.
Add the shredded pork to the skillet and press down with a spatula, searing for 3-5 minutes until the edges are golden and crispy.
Warm the corn tortillas in a separate dry pan over medium heat for 30 seconds per side.
Assemble the tacos by filling the tortillas with the crispy pork.
Top with diced white onion, chopped cilantro, and sliced radishes.
Serve immediately with fresh lime wedges for squeezing over the top.