Question about Halo 3 ODST Campaign?

[Raghav G]

ok i finshed the game on normal for single player. but i also played online with my friends and got some missions done on Legendary. So i have a few missions left. If I got them done on Legendary SOlo would ig et the achievement for finished the campaign on Legendary? Thanks!

 

[Hawkins1117]

YES, either way you beat the game on legendary

 

[Joe]

Well...I don't think so. You have to complete the game on Legendary by yourself.

Do it with your friends...

 

[BILLY BOB]

to get the legendary achievement just finish the last level on that difficulty and it will unlock the heroic and ledgendary.

 

[Daniel C]

That's how halo 3 did it, so yes.