Toss together shrimp, sliced onions, lime juice, Sazón, and fresh jalapeños. Refrigerate for 1 to 2 hours or until well chilled.
Stir together tomato sauce, ketchup, tomato clam juice, hot sauce and Adobo seasoning until blended; toss with shrimp mixture.
Divide mixture among 8 glasses. Top with avocados, cucumber and cilantro. Serve with tortilla chips.
Note: Alternatively, serve shrimp cocktail with tostadas or fried tortillas.