I know I have seen a list online somewhere that shows, for each class, what archetypes are compatible with each other. Does anyone know where to where a list like this would be?
I don't know about that, but on http://www.d20pfsrd.com/ in the class section there, each class has a table with their archetypes and what this archetype replaces/modifies.
It's not too hard to see which archetypes work/don't work together from that.
There's not that much point to a list beyond the ones in PFSRD which are for each class. Archetypes don't cross class boundaries the interaction is within the class itself.