In a large bowl, create the dressing by whisking together Greek yogurt, mayonnaise, lemon juice, Dijon mustard, lime zest, and a good pinch of salt and pepper.
Once the dressing is smooth, gently fold in the cooked shrimp, diced avocados, cucumber, red onion, fresh dill, and parsley, ensuring the avocado remains intact.
Assess the seasoning and add more salt, pepper, or lime juice as needed before serving.
Serve immediately for the best texture or chill in the fridge for about 30 minutes for the flavors to meld.