Make the Cocktail Sauce. In a large bowl, whisk together the Clamato, ketchup, lime juice, orange juice, Jugo Maggi, Worcestershire sauce, hot sauce, salt, and black pepper until well combined. Taste and adjust the seasoning as needed.
Prepare the Vegetables. If you haven't already, seed and finely dice the cucumbers and tomatoes. Finely dice the red onion, mince the jalapeño, and chop the cilantro.
Combine the Cocktail. Add the shrimp, cucumbers, tomatoes, onion, cilantro, and jalapeño pepper to the bowl with the cocktail sauce. Gently stir until everything is evenly coated.
Chill. Cover and refrigerate for at least 30 minutes to allow the flavors to meld.
Finish & Serve. Just before serving, gently fold in the diced avocado. Spoon into serving glasses or bowls and garnish with extra cilantro, diced onion, and hot sauce. Serve cold with tostadas, saltine crackers, and lime wedges.