In a medium bowl, combine the shredded chicken with olive oil, cumin, smoked paprika, chili powder, garlic powder, salt, and pepper. Mix until the chicken is well coated with the spices.
Heat a skillet over medium heat. Add the seasoned chicken and sauté for about 5-7 minutes, allowing the flavors to meld and the chicken to heat through.
While chicken is cooking, warm the corn tortillas in a separate skillet over low heat for about 1 minute on each side until pliable.
Assemble the tacos by placing a generous amount of the spiced chicken on each tortilla.
Top each taco with chopped cilantro, diced pineapple, avocado slices, and red onion.
Serve immediately with lime wedges on the side for squeezing over the tacos.