In a bowl, combine the orange juice, lime juice, olive oil, crushed garlic, cumin, smoked paprika, oregano, salt, and pepper.
Rub the chicken with the marinade and let it sit for at least 1 hour, or preferably overnight.
In a grill pan or on a grill, cook the chicken over medium heat for 5-7 minutes per side, until golden brown and cooked through.
Remove the chicken from the grill, let it rest for 5 minutes, then cut into thin strips.
Chop the onion, tomatoes, cilantro, and avocado.
Warm the tortillas in a dry skillet or directly over a flame until slightly charred.
Fill the tortillas with the grilled chicken, then sprinkle with fresh cilantro, chopped onion, and avocado.
Before serving, squeeze fresh lime juice over the tacos to enhance the flavors.
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