Dark Champion achievement

[João Tabaco]

I just don't know how to achieve it. Here's my problems, if some noble soul could help me solve it:
First, after i beated the final boss for the first time, his mission didn't appeared again, nor even in the "missions - story" menu, so how I can start it again?
Second, I can make a "dark matter star" with the respective God Option, but isn't it negate the pre-requisite of don't using physics/god options of the achievement?
Third, if I'm correct, would I have to erase my mission progress, start with the Dark Matter God Option and then complete the missions again until the final boss?

Thanks!

[Murudai]

Spoilers.

You can restart the boss mission in God Options.
To make a dark matter star, use God Options to spawn as a Dark Matter asteroid (only available if you beat the game without the ingame cheats) then grow to a star like normal.
And spawning never erases your missions. You have to actually select 'Clear Data' to do that.

[The Atomic Ass]

I beat a few of the missions with cheats, but then went back and beat them without, yet I still do not see the DM Asteroid option in the God Options. Any suggestions?

[Voden]

If you check your missions on the main menu, I believe it will show any mission you completed without cheats in green, and missions completed with cheats on are either still greyed out or they're a different color (I haven't unlocked God Options yet).

[The Atomic Ass]

All of them are green.

[MestreLion]

If all "regular" missions are already green, try to clar the Boss Mission *only* (in God Options). Then beat the boss without cheats, and the "Dark Matter" should appear in your god options.

[The Atomic Ass]

Ahh, that hadn't even crossed my mind. Thank you. :)