Age of Apocalypse

Alpha
X-Men: Alpha #1

X-Men: Chronicles #1
X-Men: Chronicles #2

One
Generation Next #1
Astonishing X-Men #1
Gambit & The X-Ternals #1
Weapon X #1
Factor X #1
X-Man #1
X-Calibre #1
Amazing X-Men #1

Two
Astonishing X-Men #2
Amazing X-Men #2
Gambit & The X-Ternals #2
Generation Next #2
Weapon X #2
X-Calibre #2
Factor X #2
X-Man #2

Age of Apocalypse: The Chosen #1

Three
X-Calibre #3
Factor X #3
Astonishing X-Men #3
Amazing X-Men #3
X-Man #3
Weapon X #3
Generation Next #3
Gambit & The X-Ternals #3

Four
Astonishing X-Men #4
Generation Next #4
Gambit & The X-Ternals #4
X-Man #4
X-Calibre #4
Factor X #4
Weapon X #4
Amazing X-Men #4

Omega
X-Universe #1
X-Universe #2
X-Men: Omega #1