Originally Posted by Zhou Tai of Wu
Basically to me the TL;DR of this is:
1)start with ambition. Level until you can do 100 in a row
2) get fortune hunter to 20 to begin the weapons. Best on yellow turban, Jesus forces.
3)story. beat every star though it make take a while
4) Mop up movie/events. Not hard if you are looking at a guide.
5) beat everything on chaos. You unlock a bunch from story but its better to start with chaos than beginner.
6) complete bonds in ambition. This is a haul but its essentially the final step. If you got fortune hunter 20 early here you shouldn't be missing much, if any. Now just wait until you have bonds with a male and female and boom, 1000g.
Edit: you don't have to beat every mission in story and free mode, so use your favorite character and go wild in free mode for chaos.
Don't forget you have to get every characters 5th weapon. You don't have to do all star objectives btw.