Are you saying its possible to get all achievements in 5 hours. Some missions in campaign can take up to 2 hours. Plus going back through the game and getting the other achievements missed. This is more like a 10-15 hours for 1000G.
Also you said hardest in the series? I would say Halo Wars was the hardest if you counted that.
Last edited by SpongebobRoundpants; 11-16-2011 at 06:00 AM.