Cut the pork butt into smaller even pieces. Add the pork,, onion, chipotle chili powder, cumin, oregano, and salt, orange zest and juice over top pork to the Instant Pot.
Pour the beer around the meat.
Put the lid on the Instant Pot, place it in the seal position and pressure cook for 45 minutes, allowing pressure to naturally release for 10 minutes.
Check meat at the end of cooking. If it seems a little tough, place meat in for an additional 15 minutes.
Pre heat oven to BROIL.
Take all the pork and put on a sheet pan. Shred and pull pork apart with two forks and spread over the entire sheet pan. Make sure the shredded meat is moist. Use some of the broth from the instant pot to make to moisten before you broil. Broil 5 to 6 minutes until the pork gets nice and crispy edges.
Squeeze 1/2 a lime over all the meat once it comes out of the oven.
Serve on warm tortillas with your favorite taco accompaniments or Use for delicious pork nachos!