That being… There are None.
There’s No reward for learning to play the class and actually engaging with it in a meaningful way. The Skins are locked behind a paywall that costs Double what the actual class costs.
This is only the case with WPoS and SoTT , with Outcast Engineer having Unlockable , mostly Skill-based Skins, and Grail Knight having Unlockable, Mostly skill-based Skins.
I need to ask, Why did FatShark Switch to this model? Sure, there’s some Achievements that are virtually Unobtainable without bugging the game out or Cheesing it ( Bombing an airborne Rat Ogre, anyone? ) , But You could still Feel like you accomplished something. Seeing someone with the Skins meant You could put a little faith in them, because they at least played enough to Know some of the mechanics required.