Heat the avocado oil in a small saucepan until warm.
Remove from the heat and stir in the ancho chile powder, cumin, salt, oregano, smoked paprika and black pepper.
Allow the spices to bloom in the oil for about 15 minutes.
Pour the oil mixture into a food processor or blender; add the lime juice, zest, Worcestershire, orange juice, tamari, honey and garlic and blend until smooth.
Place the chicken in a ziploc plastic bag and scrape in the marinade.
Cover or close and chill 3 to 4 hours. (Don't marinate longer, or the texture will change.)
Heat a cast-iron grill pan or grill to medium-high heat until very hot. Add the avocado oil and grill the chicken until well-charred on both sides and the internal temperature registers 160 degrees F, 6 to 7 minutes per side.
Remove from the heat and set aside to rest before slicing.