Until now with my weaver and goldsmith I have been diligently crafting all items in the logs. which can be quite a waste of time/gil looking for the right material and then I end up with gears nobody wants apart from few selected ones.

Is it really necessary to do it or I will get the new "recipes" just leveling the classes up? I imagine there is an achievement (maybe a PS3 trophy as well?) for it, but I wouldn't mind to skip most stuff for now.