Season the pork shoulder with sea salt, black pepper, ground cumin, and dried oregano, rubbing it into all sides of the meat.
Place the seasoned pork in a slow cooker along with the minced garlic, orange juice, and lime juice.
Cover and cook on low for 7-8 hours or on high for 4-5 hours until the meat is tender and easily shreds with a fork.
Once cooked, remove the pork from the slow cooker and shred it using two forks, discarding any excess fat.
Heat a non-stick skillet over medium-high heat and add the shredded pork, cooking for 3-5 minutes until the edges become golden and crispy.
Warm the corn tortillas in a dry pan or over an open flame until pliable.
In a small bowl, stir the Greek yogurt with a splash of lime juice to create a crema consistency.
Assemble the tacos by dividing the crispy pork between the tortillas, then topping with the yogurt crema, diced red onion, and fresh cilantro.