How many quests are in Fable 2?

There are 81 quests all total. Some are mandatory, but others are optional. Some quests have to be triggered by doing certain actions. You can play all the way through the game and never have them appear. An example of this is the Blackmail quest. If you only have one family at a time, this quest will never appear. If you get married to two or more spouses and keep them for long enough, you will eventually be blackmailed and have to go deal with it. There are other quests that are not available until you beat the game.