UPDATE- All event titles can now be found under the Event Titles spoiler and all titles from villagers can be found under the Villager Titles spoiler.
Spoilers were moved around to organize the thread.
I will be keeping this thread updated from now on with the help of the EN staff and players.
100% agree, this thread is extremely useful. I browse it almost all the time trying to determine which titles I want to try to earn, or looking at how to get a certain title I saw in-game. Definitely a great thread, and the people who upkeep it are equally great.