For spicy shrimp, combine shrimp and all other spicy shrimp ingredients in a bowl. Let the shrimp sit and marinate on the counter for 15 minutes.
While the shrimp is marinating, prepare all the mango salsa ingredients and mix them together. If you are having the avocado crema, make this now too.
Heat a large skillet over medium-high heat. Once water sizzles when dripped in, add the shrimp and all the marinade to the skillet. Cook, stirring frequently until the shrimp is pink and cooked through, 3-4 minutes. Using a slotted spoon, remove the shrimp to a bowl. Cook down the sauce until it's quite thick, 1 minute. Pour the thickened sauce over the shrimp.
Serve the shrimp in the taco shells with the mango salsa and avocado crema.