Originally Posted by Xenolith666
I went through all 4 different playthroughs, but didn't get half the achievements, like Chief Engineer, Planet Cracker, Infectious, and All your trace belong to us.. guess I'll have to do them again.
you only have to do the online playthrough (way) again - only do it locally this time! The online playthrough doesn't count towards those achievements! The OP did a mistake in his roadmap!