Hello, I am racing RR3 since few years, have level 250+ and 100+ cars. Recently I see (again) achievements popping up while racing. I am however not sure these particular achievements can be found under my achievements.

Also I still do not really understand how achievements are computed and do work.
- there are trophys, points, and gold shown
            - what are the trophys for?
            - what are the points for?
- once I collect the gold for the particular achievements, what happens? seems like overall achievement list changes over time?

any hints for more information appreciated.