Please look into tuning onslaught triumphs. They take way to long to complete when on average it takes over an hour to finish 1 clear and you currently need 40 clears and 50 boss kills. Only 1k players have these triumphs. Please consider tuning them very soon.
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The Barons killed one used to be 250. They tuned that because it was part of the title. Very unlikely they will lower the ones you are asking about. Although there has be plenty of feedback asking for the same thing. If you care about that triumph, keep working on it like it will not be reduced. So you don't miss out.