Seafood Cocktail (Cóctel de Mariscos)

Ingredients

• 2 lb. medium cooked shrimp, peeled, deveined, tails removed
• 1⁄2 cup shucked raw clams
• 1 cup tomato juice
• 1⁄4 cup olive oil
• 2 tbsp. fresh lime juice
• 2 tbsp. minced red onion
• 1 1⁄2 tsp. Mexican hot sauce, such as Cholula
• 1 1⁄2 tsp. Worcestershire sauce
• 4 cloves garlic, peeled
• 2 canned chipotle chiles in adobo, plus 2 tbsp. adobo sauce from can
• Kosher salt
• freshly ground black pepper
• 1⁄4 cup thinly sliced cilantro
• 1⁄2 avocado, halved, pitted, peeled, and thinly sliced
• Saltine crackers, for serving