Add the mushrooms to a ziplock bag. Next add the olive oil, orange juice, garlic, chipotle peppers, paprika, lime juice, cilantro, and a large pinch of salt. Seal the bag and marinate 10 minutes or in the fridge up to overnight.
Meanwhile, stir together the avocado, lime juice and zest, and a pinch of salt.
To make the salsa. In a bowl, combine the pineapple, jalapeño, lime juice, cilantro, and a pinch of salt.
Preheat your grill or grill pan to high. Remove the mushrooms from the marinade and sear for 5 minutes, flip and sear another 5 minutes or until lightly charred on both sides. Slice into strips.
Spread the avocado onto the warmed taco shells, and top with the mushrooms, salsa, and cheese. Enjoy!