In a large bowl, whisk together the olive oil, apple cider vinegar, adobo sauce, honey, cumin, smoked paprika, garlic powder, onion powder, oregano, salt, and black pepper 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 skillet over medium-high heat. Remove the chicken from the marinade, letting any excess drip off.
Grill or cook the chicken for about 6-7 minutes per side, or until the internal temperature reaches 165°F.
Remove the chicken from the heat and let it rest for 5 minutes before slicing it into strips.
Warm the tortillas on the grill or in a skillet for about 30 seconds on each side.
Assemble the tacos by placing sliced chicken on each tortilla and topping with diced onions, chopped cilantro, avocado slices, and a squeeze of lime juice.