Preheat oven to 400°.
Heat oil in a large nonstick skillet over medium-high heat. Add onion and garlic; sauté 2 minutes or until onion begins to soften. Add cumin, chipotle, and cinnamon; cook 30 seconds, stirring constantly. Add chicken; cook 4 minutes or until chicken is done, stirring to crumble. Add salsa, water, and salt; cook 3 minutes or until slightly thickened. Stir in cilantro and lime juice; remove from heat.
While chicken cooks, place tortillas directly on oven rack; bake at 400° for 5 minutes or until slightly crisp. Place 1 tortilla on each of 4 plates; top each tortilla with 1/4 cup lettuce, 3/4 cup chicken mixture, 1/4 cup cheese, and 1 tablespoon sour cream.