Gather all ingredients.
Mix onion with lime juice in a small bowl and allow to stand for 10 minutes.
Meanwhile, toss shrimp, roma tomatoes, cucumber, celery, jalapeno, salt, and black pepper in a medium bowl until thoroughly combined.
Whisk tomato and clam juice cocktail, ketchup, cilantro, and hot pepper sauce in a separate bowl; stir dressing into shrimp mixture.
Gently fold in avocados. Stir in onion mixture. Cover and chill thoroughly, at least 1 hour.
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