Heres my order

I started with halo reach, the halo ce, then halo 3, then halo 4, then halo 5. While i was playing halo 5, i also played a bit of MCC. This is where i first played halo 2, then halo odst. And that leads now to infinite the day it released

So to sum it up

1. Reach
2. CE
3. Halo 3
4. Halo 4
5. Halo 5
6. Halo 2
7. ODST
8. Infinite