Mix together the mayo, orange juice concentrate, lime juice, cumin, and hot sauce in a small bowl. Set aside.
Season chicken breasts with salt and pepper. Cook in a nonstick skillet coated with cooking spray over a medium-high heat for 5 minutes on each side. Reduce heat to low. Cover, cook for 5 more minutes or until done. Remove from heat and cut diagonally across the grain into thin slices.
Spread 1 tablespoon citrus mayonnaise on each of the four bread slices. Top with lettuce, chicken, tomatoes, avocado, and remaining bread slice.