Horizon Forbidden West : Normal - All New Skills Learned Trophy

I unlocked the All New Skills Learned Trophy when I loaded the Horizon Forbidden West DLC : Burning Shores. The DLC features 18 new Skills (12 Skills and 6 Valor Surges), all listed at the bottom of each respective tree. To unlock this trophy, you must buy them all for a total of 72 Skill Points. I unlocked this trophy as I have about 500 Skill Points left from my 4 playthroughs of Horizon Forbidden West.