Do we ever become truly satisfied by the things we achieve? do we really know when enough is enough?
I mean look at western culture. Buy Buy Buy. Spend more so that you will feel better. I find it hard to believe that we all at some point become truly satisfied with achieving things. We may move on to other things once we've accomplished something in one area but still we want more of something. This is just our fallen nature.
For our achievements to be really worthwhile I think they should not be tied to the things of this world. (money, titles, rank, possessions, etc). Only then do I think we feel more satisfied in our life.