halo 3 question

[louder]

what playlist can i play infection or any kind of infection variant on? or is it only doublexp?
i've only got like 6 achievements left on that game or something & 2 of them are the infection ones worth 25g each.

+rep.

[Jack!]

Some of them you can do in custom games i think

[samsaBEAR]

Some of them you can do in custom games i think
Nope, they all have to be proper social/ranked playlists.

Infection only comes around every now and then, so you'll have to wait till the next time it's on.