One Federal Decision Act of 2020 This bill provides statutory authority for the policy that requires federal agencies to coordinate environmental reviews and authorization decisions for major infrastructure projects. It also sets a goal for completing environmental reviews within two years. The Department of Transportation (DOT) must review existing practices, procedures, programmatic agreements, and applicable laws to identify potential changes that would facilitate an efficient environmental review process for projects. All authorization decisions for construction of a major project must be completed within 90 days of the issuance of a record of decision for the project, although the lead agency could extend the deadline in some cases. The lead agency must develop an environmental review schedule with the project sponsor that is consistent with an agency average of not more than two years for the completion of the environmental review process for major projects. DOT must also (1) establish a performance accountability system to track each major project, and (2) provide other relevant federal agencies with a list of categorical exclusions under the National Environmental Policy Act that are applicable to highway projects and that would accelerate project delivery.