κατορθωτής
From LSJ
ἀκμὴ οὐδὲ ἔχει γενέσεως ὑπόστασιν καθ' ἑαυτήν → the culmination has no power of originating by itself
English (LSJ)
οῦ, ὁ,
A one who successfully accomplishes, πραγμάτων, ἔργων, Vett. Val.48.3, Max. Tyr.21.6. 2 τριῶν ἀνδρῶν δημοσίων πραγμάτων κ., trans. of Lat. triumvir reipublicae constituendae, Mon.Anc.Gr.4.2.
German (Pape)
[Seite 1405] ὁ, der Rechtmachende, Verbesserer, glücklich Ausführende.