Gillianís Diary, Part 2 is one of the People Lore Books you have to find and read in order to complete the A Quick Study Achievement. Listed below is where you can find Gillianís Diary, Part 2 and how to obtain Gillianís Diary, Part 2
Gillian's Diary, Part 2 - Old Tristram Road, The Old Ruins - Gillian's Diary, Part 2 People Lore Book will drop from an old keepsake box found at the Old Tristram Road or The Old Ruins during the Fallen Star Quest
More guides can be seen at the Diablo III Forums. The complete list of all People Lore Books can be found at the Diablo III A Quick Study Achievement Guide. If you have more info about Gillianís Diary, Part 2 please post them below.