That is a link to where you can get a map of all the lovelorns. They will be labeled by purple dots.
Also to get to the top of the Hokage building you have to go to the lake where you meet Jiraya at, and where sasuske is in the beggining of the game. You need to be able to walk on water, and have clone jutsu at level 3. Find what you need to break in the middle island of the lake and you'll find a gold coin and after breaking another door youll be warped to top of hokage building. Once you climb upstairs you get achievement.
Lastly the other hidden achievement is getting a perfect on somebody in the game. Any thug will do.