In a large bowl, combine the pineapple juice, orange juice, white vinegar, adobo sauce, olive oil, cumin, oregano, garlic powder, onion powder, smoked paprika, salt, and black pepper. Whisk until well combined.
Add the chicken thighs to the marinade, ensuring they are fully coated. Cover and refrigerate for at least 1 hour, or up to overnight for best flavor.
Preheat your grill or a grill pan over medium-high heat. Remove the chicken from the marinade and discard the marinade.
Grill the chicken for about 6-7 minutes per side, or until fully cooked and the internal temperature reaches 165°F. During the last few minutes of grilling, add the diced pineapple to the grill to caramelize.
Remove the chicken from the grill and let it rest for 5 minutes before slicing it into thin strips.
Warm the corn tortillas on the grill for about 30 seconds on each side, or until pliable.
Assemble the tacos by placing a generous amount of sliced chicken on each tortilla, topping with grilled pineapple, diced onion, and chopped cilantro. Serve with lime wedges on the side.