In a mixing bowl whisk together 1 tablespoon lemon juice, lemon zest, salt, and pepper; add in the shrimp, toss to coat, and set aside until ready to use.
Heat olive oil in a large 12-inch skillet set over medium-high heat.
Add onion and cook for 3 to 4 minutes, or until softened.
Stir in the garlic; cook and stir for 15 seconds.
Add orzo and cook for about 4 minutes, or until lightly browned, stirring frequently.
Stir in the chicken broth and bring to a boil.
Cook for 6 minutes, stirring occasionally.
Stir in the olives and ¼ cup feta cheese.
Stir in the remaining lemon juice and season with salt and pepper.
Nestle shrimp into the orzo; cover and cook for about 3 to 4 more minutes, or until shrimp is opaque and cooked through.