Note that the sections of this walkthrough are broken up into the various chapters and overviews given by Marquis Halim Ondore IV. Unfortunately, this does not break the game up into even sections, but it does provide some markers that can be used to identify different sections of the guide.
These walkthrough sections are full of spoilers. Do not read ahead if this is your first time playing through the game.
Section 1 - Chapter 12
The first section of the walkthrough contains an overview of the strategy guide and the tutorial sections in the introduction of the game with Reks and Basch.
Section 2 - Chapter 13
The second section of the game joins Vaan in Rabanastre and follows him and the team through as they rescue Basch from the Barheim Passage, Ashe from the Dreadnought Leviathan and travel through the Ogir-Yensa and Nam-Yensa Sandsea to reach the Tomb of King Raithwall. It concludes in the Shiva airship.
Section 3 - Chapter 16
The team travels to villages of Jahara and Eruyt before venturing to Mt Bur-Omisace. After defeating Judge Bergan in the temple, they make their way through the Phon Coast and Tchita Uplands to the Imperial City of Archades. This section concludes in the Draklor Laboratory.
Section 4 - Chapter 17
Heading to the Ancient City of Giruvegan, into the Great Crystal and the Balfonheim Port. This section also includes climbing the Pharos at Ridorana through the First, Second and Third Ascent before concluding with end game preparations and the end of the story on the Sky Fortress Bahamut.