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Just as the title says. I'd much rather play the CE campaign then the reach campaign. If I had to do it on reach I'd probably just use the target locator on ONI and be bored for 5 minutes or so.
No you cannot.
Buddy, you can only get achievements playing the game they are in.I can't load up.. let's say TFU2 and get an achievement unlocked for TFU1.