wise bass18: what do you have to do to get the 100% complete achievement? I've beat the game on co-op and on legendary and I'm a major. what do I need now?
u're just missing the campaign achievements (Everything's Better With Bacon, Micro Manager, . . etc), and Titan Achievement. For the Titan Achievement I played deathmatch 1v1 skirmish against an easy AI on Release. I activated all the debuff skulls, captured all the extra bases, and camped out the flood release areas. I put a spartan at each flood activation switch and released flood as much as I could for about an hour. After the hour was up I killed the AI and finished the match. It might take less than an hour to do it, but I just didn't know how to check the score in-game at the time.
here's a guide with some strategies and tips for the orginal 50 achievements:
http://www.xbox360achievements.org/game/halo-wars/guide/
Practice Makes Better. Not Perfect