In a medium bowl, toss the peeled and deveined shrimp with the chili powder, cumin, garlic powder, and sea salt until evenly coated.
In a separate small bowl, combine the shredded cabbage with half of the lime juice and a pinch of salt to create a quick slaw.
Heat the avocado oil in a large skillet over medium-high heat. Add the shrimp in a single layer and cook for 2 minutes per side until pink and opaque.
While the shrimp cooks, warm the corn tortillas in a dry pan or over an open flame for 30 seconds per side until pliable and slightly charred.
Slice the avocado into thin wedges and chop the fresh cilantro.
Assemble the tacos by layering the cabbage slaw, chili-lime shrimp, and avocado slices into the warm tortillas.
Garnish with fresh cilantro and a final squeeze of the remaining lime juice before serving.