Smoky Orange Chicken Thighs

Name: Smoky Orange Chicken Thighs
Ingredients: 8 garlic cloves, finely grated; 2 canned chipotle chiles in adobo sauce, finely chopped, plus 2 Tbsp. adobo sauce; ⅓ cup tomato paste; 2 Tbsp. apple cider vinegar; 2 Tbsp. Diamond Crystal or 1 Tbsp. plus ½ tsp. Morton kosher salt; 2 Tbsp. smoked paprika; 2 Tbsp. sugar; 2 Tbsp. vegetable oil; 2 large oranges, halved, divided; 6 large skinless, boneless chicken thighs (about 2½ lb.), patted dry; 2 large red onions, cut through root ends into ½-thick wedges; Warm tortillas, cilantro leaves with tender stems, and lime wedges (for serving)