Let me rephrase for the hard of hearing:
You can just do five daily quests today with your orphan out and you'll get the achievement. You don't need to repeat the same quests for the rest of the week.
It should be noted that this is a hotfix applied this morning, and that the achievement text is you'll see via your achievements window is incorrect. This change is likely due to the gigantic failure that was/is A Simple Re-Quest.
So this is the first nerf bat to the Children's Week achievements. School of Hard Knocks coming up next?