I already have halo 1, 2, 3 and half of halo 4 completed on legendary, in halo 1 and 3 i have all the archivements than are unlocked when you finalize the campaign, but in halo 2 the archievements doesnt appear, obviously, they dont are unlocked, when i was cheking the archievments of halo 2 i realized that i dont have unlocked the gravemind mission finalized one, but i already have that mission completed!! i think than the problem would be fixed if i reinitiate that mission but i dont really want to play againg that mission. if there is something else than i could do, tell me please. Pd, excuse my English, i still learning it, thanks!