Combine the first 9 ingredients (everything but the beer and chicken) in a blender and blend until mixed well.
In a large bowl, add chicken, beer, and blended sauce. Marinate in the fridge for 1 hour to 4 hours.
Pour the chicken and marinade into your pressure cooker. Manually set for 35 minutes and then let it naturally release.
Using two forks, rip the chicken apart into shreds. Serve on warmed tortilla shells, topped with fresh slaw, tomatoes, avocado, sour cream, salsa, etc...