Offshore Accountability Act of 2020 This bill establishes disclosure and reporting requirements for operators of offshore oil or gas facilities after equipment failures of critical systems. Such operators must notify the Department of the Interior and the manufacturers of the equipment of such failures. In addition, the operators must provide equipment failure analyses to Interior and the manufacturers. Interior must post the analyses on its website. Finally, operators must report to Interior on (1) changes made by such manufacturers to the design of critical systems as the result of reported failures, and (2) changes in the operators' procedures as a result of reported failures.