R1

.hack legend of the twilight (manga) chapter's 1-4
.hack sign (anime) episodes 1
.hack legend of the twilight chapter 5
.hack sign episodes 1-6
.hack legend of the twilight chapter 6
.hack sigh episodes 7-10
.hack legend of the twilight chapter 7
.hack sign episodes 11-12
.hack part 1 infection (game) + .hack liminality vol 1 (ova)
.hack sign episodes 13-14
.hack legend of the twilight chapter 8
.hack sign episodes 15-19
.hack legend of the twilight chapter 9
.hack sign episodes 20-22 (and a recap you should skip)
.hack part 2 mutation (game) + .hack liminality vol 2
.hack legend of the twlight chapter 10
.hack sign episodes 23-25 sep 25
.hack ai buster volume 1 (book)
.hack legend of the twilight chapter 11-13
.hack part 3 outbreak (game) + .hack liminality vol 3
.hack ai buster volume 2
.hack legend of the twilight (anime) episode 1
.hack legend of the twlight (manga) chapter 14
.hack legend of the twilight (anime) episode 2-5
.hack legend of the twilight (manga) chapter 15
.hack legend of the twilight (anime) episode 6-9
.hack legend of the twilight (manga) chapter 16
.hack legend of the twilight (anime) episode 10-12
.hack legend of the twilight (manga) chapter 17
.hack part 4 quarantine + .hack liminality vol 4 + .hack gift
.hack legend of the twilight chapters 18-14
.hack legend of the twilight "lets meet offline" (audio drama based on the anime)
.hack sign ova's 1-2
.hack another birth volumes 1-2
.hack fragment
.hack another birth volume 3-4

R2

GU the world issue 1 (magazine that published multiple different .hack things monthly, this one had chapter 1 of the manga GU+, GNU, .hack 4koma as well as chapter 1 of the book .hack cell)
GU the world issue 2 (chapter 2 of the above, plus the prologue chapter for the .hack XXXX manga)
GU the world volume 3 (chapter 3 of GU+/GNU/4koma/cell, chapter 1 of XXXX
.hack roots (anime) episode 1-4 (april 26th)
GU the world volume 4 (chapter 4 of GU+/GNU/4koma/cell, XXXX chapter 2)
.hack roots episode 5-7
.hack GU vol 1 rebirth (game)
.hack roots episode 8
GU the world volume 5 (GU+/GNU/4koma/cell chapter 5, XXXX chapter 3
.hack roots episode 9-12
GU the world volume 6 (GU+/GNU/4koma/cell chapter 6, XXXX chapter 4
.hack roots episode 13-17
GU the world volume 7 (GU+/4koma/cell chapter 7, XXXX chapter 5. hack alcor chapter 1)
.hack roots episode 18-23
GU the world volume 8 (GU+/4koma/cell chapter 8,XXXX chapter 6, alcor chapter 2
.hack roots episode 24-26
.hack GU vol 2 reminisce (game)
GU the world volume 9 (GU+/4koma/cell chapter 9, XXXX chapter 7, alcor chapter 3)
GU the world volume 10 (GU+/4koma/cell chapter 10, XXXX chapter 8, alcor chapter 4
GU the world volume 11 (GU+/4koma/cell chapter 11, XXXX chapter 9, alcor chapter 5)
.hack GU vol 3 redemption (game)
.hack roots OVA
GU the world volume 12 (GU+/4koma/cell chapter 12, XXXX chapter 10, alcor chapter 6)
.hack GU+ chapters 13-26
.hack GU trilogy (movie)
.hack gu volume 4 + gu ragtime + The Duplicate Phenomenon (new content for GU caused by the recent re-release)

Everything Since/RX
.hack link twilight knights (manga) chapter 1-6
Epitaph of twilight volume 1 (book)
.hack link chapter 7-11
epitaph of twilight volume 2
.hack link chapter 12-20
.hack link (game)
.hack quantum (ova series)
.hack quantum+ & introduction (manga)
.hack quantum twin hearts (book)
.hack the movie (duh)
.hack bullet (novel, constantly got new chapters between 2012 and 2017)
.hack versus (game, bundled with the home release of .hack the movie)
Sora beyond the world (manga)