Step 1
Marinate the chicken: Combine the orange juice lime juice, achiote paste, garlic, cumin, oregano, salt, and allspice in a blender. Then add to a large ziploc bag or non-reactive bowl. Add the chicken and marinate for at least 1 hour, but no more than 4 hours.
Step 3
Shred with 2 forks and let sit in the slow cooker in the juices for 15-30 minutes if possible. Serve with warmed corn tortillas, limes, pickled red onions, cilantro, and habanero salsa.