I got all the golds for all the speeds on the classic tracks, I then got all the golds for all the speeds on the wipeout tracks and I then spent far too much time completing all the challenges, including playing the last wipeout combo one almost 100 times. I was expecting it to to say "well done" or something nice, but nothing. Well almost nothing, it said "combo challenges completed".
Then thinking irratically I produced my own grids for the prototype tracks and have just got all the golds on all the ships at all the speeds. And the game said nothing. But I may have missed a vector one or two...
So at my housemates insistence I've come online to find out if I have done everything I can do in the game or whether there is yet more to do...