I've never seen one, but it'd be a great resource to have especially if it links to other resources that teach certain skills.
I do, however, think that the field of rationality isn't codified enough to make a meaningful skill-tree. You can probably make a simple or bare-bones version and I think having that would be better than having nothing.
What would be on it? Skepticism, akrasia-fighting, research, social skills...
A while back I came across a delightful web developer skill tree, and I was wondering if technical rationality has gotten to the point where someone could make one of these for an aspiring rationalist.
I think seeing a clear progression from beginning skills to advanced ones laid out graphically helps those starting on the path conceptualize the process.