Heat a skillet over medium heat. Add 1 tablespoon olive oil and the onions; cook until soft. Stir in the seasonings and the tomatoes and chickpeas. Cook for 5 minutes and add the lime juice and salt.
Heat the tortillas either in the microwave or a dry skillet. Fill each one with some of the chickpea mixture, roll up, and lay seam side down on baking sheet. Brush with remaining olive oil, and bake until tortillas are browned and crisp, about 15 minutes.
Serve topped with the lettuce, guacamole (if using), yogurt, cheese, tomatoes, and radishes.