Once all of the meat is browned, add the beer to the cooker to deglaze the pot. Scrape the browned bits from the bottom of the pot. Add the meat back to the pressure cooker along with the salsa, tortilla chips, chipotle peppers, adobo sauce, tomato paste, chili powder, and cumin, and stir to combine. Lock the lid in place according to the manufacturer's instructions. When steam begins to hiss out of the cooker, reduce the heat to low, just enough to maintain a very weak whistle. Cook for 25 minutes. Remove from the heat and carefully release the steam. Season with additional salt, if desired. Serve immediately.