How do you get to zone 6 in Sonny 2

If you want to get to Zone 6, you have to play through Zones 1~5 in Heroic Mode.
But if you also want to get to Zone 7, you have to get the legendary acheivement, playing through Zones 1~5 (Or maybe 6?) in Heroic Mode while never training or redoing any bosses for "Golden" weapons.
(Maybe you have to do it in Psycological mode, maybe not)