最贴切的翻译是:
I got the job done, whether by hook or by crook.
"by hook or by crook" 是英语里一个历史非常悠久的成语,意思是不择手段地用尽一切方法去做一件事.
如果不想有不择手段的含义,那么不容易翻得很贴切:
I tried every possible way and finally finished the task.
I left no stone unturned to finish up my task/assignment.
当然LS的说法也可行。
I leave no stone unturned completed the task