Add the orange juice, chipotle peppers, oregano and cinnamon to a blender. Puree the salsa until smooth and set aside.
Heat the olive oil in a large skillet over medium heat. Add the chicken thighs and cook for 7 minutes on each side or until golden. Transfer the chicken thighs to a plate.
Add the remaining 1 tablespoon of olive oil to the pan along with the pineapple, onions, garlic and salt. Saute for 5 minutes or until the onions are transluscent.
Return the chicken to the pan and pour in the salsa. Cook the chicken in the salsa for 8 minutes. Traansfer the chicken to a cutting board and shred using 2 forks. Return the shredded chicken to the pan and stir ensuring the chicken is fully coated with the salsa.
Spoon the chicken onto corn tortillas. Serve as is or garnish with cilantro, pickled onions and cotija cheese.