Preheat oven to 350º F.
Season shrimp with the taco seasoning mix in a medium bowl.
Then, heat a medium ovenproof skillet over medium heat, add oil, and cook shrimp for about 2 minutes on one side and turn to cook another 2 minutes.
Squeeze on half of a lime and place on a plate or in a bowl.
Layer a thick layer of chips, both purple and yellow, in the same skillet used to cook the shrimp.
Drizzle the nacho cheese over the chips, spoon on half of the cooked shrimp, and scatter on the shredded cheese. Repeat layering once more.
Next, bake for about 5-10 minutes, or until hot and cheese is melted.
Remove from the oven, top nachos with avocado, tomatoes, red onion, pepper, and chopped cilantro, and squeeze the other half of the lime over the garnishes.