From Longman Dictionary of Contemporary Englishmission accomplishedmission accomplishedFINISH DOING somethingused when you have successfully achieved something that you were trying to do → mission
Examples from the Corpus
mission accomplished• Napier fired the buildings and, his mission accomplished, withdrew to the coast.• His mission accomplished, Pierpont turned the plane back to Liuzhou.• Holbrooke returns to his Wall Street investment banking job with mission accomplished. 