Raiders of the Lost Artifacts (Conclusion)

Now you need to eat a snack and then rummage through the rubbish (kick over your rubbish bin and then spend 8.5 minutes cleaning it up).
Next, I had to plant onions and watch T.V. then at 76% it told me to do random tasks until I received the last thing to build the monument.
I found it when I took a shower for 1 minute, but it really could be anything. My suggestion is to try each thing for the shortest thing working your way through your house.
I planted some peppers, went to the bathroom, washed my hands and then took the shower, which earned me the hammer (I think) I needed.

Hope you are able to accomplish this quest in time! The reward really is worth it.