κατορθωτής
From LSJ
χελῶναι μακάριαι τοῦ δέρματος → you tortoises are fortunate in your skin, you blessed turtles with your shell
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.