Okay, as I read the things, but IANAL, the obvious crime(s) is that Trump solicited a bribe from the President of Ukraine as well as illegally soliciting aid from a foreign nation in a US election. That last one being the kind of collusion Trump has been denying he did with Russia.
Am I too far from the mark on this?
No, and bribery is a listed reason for impeachment, alongside treason, separate and apart from "high crimes and misdemeanors."