There's no comprehensive list anywhere if that's what you are asking. There's a "Fare Rules" link on the web page after you have selected the award flights that has the fare codes for the flights and fare rule requirements. It will tell you if the award fare requires Tue/Wed/Sat travel, or has a roundtrip purchase requirement (the fare code will have an 'R' in the middle for these), and if there are any seasonal/date restrictions on the awards. It also lists any advance purchase requirements for the award (the cheapest awards typically have a 21-day advance purchase requirement domestically).