After his fall from grace, he committed every kind of wrongdoing imaginable.
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From 三国志 (吴书 · 张温传): 揆其奸心，无所不为 - 'Estimating the wickedness of his heart, there is nothing he wouldn't do.' Note: nearly always pejorative - refers specifically to evil deeds, not 'enthusiastic willingness'.
mistakes
Don't confuse with 无所不能 (can do anything = capable) or 无所不知 (knows everything = knowledgeable). Those are praise; 无所不为 is condemnation.
