Chop the shrimp into bite-sized pieces.
In a small bowl, mix onion with lime juice; allow to stand for 10 minutes.
In a large bowl, combine the shrimp, cucumber, celery, jalapeño, salt and pepper; mix well to combine.
In a separate bowl, whisk Clamato juice, cilantro and hot pepper sauce; stir dressing into shrimp mixture.
Gently fold in avocados; stir in onion mixture.
Place in an airtight container; chill in the refrigerator for at least 1 hour to let the flavors meld.