There have been discussions about these questions a few times in the forums. I think there are several objectives: puzzles, collections, gong, elders, totems and the levels of technology. But this is an open-ended game. The game is not over until you are done playing. This was hard for me at first because I was trying to win the game, figure out the mysteries. And there really isn't winning except by standards you set for yourself.
So alot of people challenge themselves in different ways. One of my games I wanted the graveyard full of esteemed elders, so I had to stay on that to ensure every person who died was an elder. Also, I have tried having tribes of red-heads, brunettes, etc. Now, I am working on having a full tribe of 115 with one type of female and one type of male. Another challenge I'm working on is having no building until all building is available...the dam is proving to be a problem there...but anyway, you see my point.
So, from one perspective, it sounds like you're done! Whoo hoo! Congrats! Are you going to set a new challenge for yourself? If so, let us know how it works out!
Good Luck!