The traits you get available is randomly selected from the list.
Common traits show up more often than uncommon, and uncommon show up more often than rares.
There is an exception at level 4, where you will have to select between one of 5 paths for your hero.
Also some traits have special prerequisites, "Lethal 1" requires for you to enter "Path of the Warrior" before it have a chance to pop up.
I have no knowledge of an easily accessible list.
Sincerely
~ Kongdej