in halo 3, i completed the game but with a mixture of difficulty settings,

[Lewis P]

should i still get the achievments? i have completed the game. but with a mixuture of heroic, legendary and normal. will i need to go through the whole game in one difficulty setting to get the achievments? and will i get the achievments if i complete it in co-op?

 

[Creath]

well, if you already beat some levels on legendary, if you go back on the levels you didn't beat ib legendary, youll get the achievments for all three difficulites. and yes youll get the achievments for coop too