Just wanted to post this here in the interest of completeness - the skill challenges from the 3 new UL skills --
Science -
Free Range Scientist - Analyze a total of 100 items
Experienced Experimentalist - Conduct 100 experiments
Street Art -
Always wanted - 5 Masterpieces
Master Muralist - 10 murals
Precision Sprayer - 30 street art projects
Social Networking -
Blog Baron - sell 5 blogs
Professional Greeter - meet 25 Sims via the SimFinder app
Matchmaker - change relationship of 30 Sims to RI or partner via the transmogrifier
Does anything that you can create via Science count to be placed (I think they can all be obtained through other means, so I'm not sure). Also, would spraypainting murals into the mausoleum count?