In the Compendium you will find all the completed main and side quests and have a better overview of the story your hero is undertaking.
Note:The Sundering (tutorial) was introduced with R151, older characters do not have these quests in their Compendium.
Act I - The Cult of Nefertari
Act II - Heralding a Return
Act III - Ancient Souls
Act IV - A Serpent's Poison