From some other thread here somewhere, i have it saved
When your average score is equal or smaller than 100 you go from hack to amateur.
When it is equal or smaller than 80 you go from amateur to pro.
When it is equal or smaller than 72 you go from pro to tour pro
When it is equal or smaller than 67 you go from tour pro to Master
When it is equal or smaller than 63 you go from Master to Tour master
When it is equal or smaller than 61 you go from Tour master to legend