Monster ShroudsFollow

ok yeah got DoD yesterday did some monster missions and also played around as a shroud got some exp and stuff, but my question is on the % completed like humanoid rogue how do you raise that % to unlock it, people have told me get exp as that shroud, question is how many yellows do i have to kill at 5,10,15 and so on to raise it if that's the case.

but please someone tell me how to raise it, i wanna unlock the other ones.