I am not an English teacher, but I used to be an engineer, so I am pretty familiar with this.
I would call the document a punch list. Here is the wikipedia entry:
Punch list - Wikipedia, the free encyclopedia
It is a list of all the tasks left to be completed before the final payment is made. Perhaps you could do an internet search to get a good format for one.
I agree that "outstanding work" would be correct but might also be confusing in this context. I think "unfinished work" would be correct also and much more clear.