. . . so that we may complete our agenda.
In the sentence above, I think it is not acceptable to native speakers to use "complete" and "agenda". It is acceptabel to them to use "draw up / establish / set our agenda". Is that right?
. . . so that we may complete our agenda is not a sentence.
At the end of the meeting, when all our planned business has been discussed, we have completed our agenda.
Your alternatives all concern formulating an agenda before the meeting.