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Halo CE Halo 2 Halo 3 Halo 3 ODST Halo Reach.
Or if you mean in terms of the main story: Halo: Reach, Halo: Combat Evolved, Halo 2, Halo 3.
Reach is based during the Fall of Reach, taking place before CE. Halo: Combat Evolved takes place directly after that, Halo 2 continues the story where Halo: CE left off, and Halo 3 continues it where Halo 2 left off, and ends the story all together.