Whisk all marinade ingredients together in a large bowl or plastic bag. Add the chicken thighs and coat them well with the mixture. Marinate in the refrigerator for 4 to 24 hours.
While the chicken marinates, prepare the pico de gallo and guacamole.
Once ready to grill, let the marinated chicken sit at room temperature for 30 minutes. Preheat your grill to medium-high heat, around 425 to 450 degrees Fahrenheit.
Grill the chicken thighs for 5 to 7 minutes on each side, or until cooked through, reaching an internal temperature of 170 degrees Fahrenheit. Let rested for 10 minutes, then chop into bite-sized pieces.
Warm the corn tortillas using your preferred method.
Assemble your tacos by layering the chopped chicken, guacamole, pico de gallo, and crumbled Cotija cheese on the warmed tortillas. Serve with lime wedges and hot sauce if desired.