Preheat the grill to medium-high heat.
In a large bowl, combine the shrimp, olive oil, salt, and pepper. Toss to combine.
Place the shrimp on the grill and cook for 3-4 minutes per side, or until cooked through.
Meanwhile, in a small bowl, whisk together the olive oil, lime juice, cilantro, garlic, salt, and pepper.
In a large bowl, combine the cooked shrimp, mixed greens, and avocados. Drizzle the vinaigrette over the salad and toss to combine.
Sprinkle the toasted pumpkin seeds over the salad and serve.