Would I be far wrong if I referred to your 'solipsistic benefits' as "pleasures" and referred to your 'accomplishment benefits' as "power"? And, assuming I am on track so far, do I have it right that it is possible to manufacture fake pleasures (which you may as well grab, because they are as good as the 'real thing), but that fake power is worthless?
I would say that, as traditionally understood, raw pleasure is the closest thing we have to a clean solipsistic benefit and power is clearly an accomplishment benefit. But I wouldn't expect either example to be identical with the conceptual categories because there are other things that also fit there. In the real world, I don't think being a really good friend with someone is about power, but it seems like an accomplishment to me.
But there is a deeper response available because a value's status as a solipsistic or accomplishment benefit changes depending...
http://www.sl4.org/archive/0708/16600.html