I would like to see more in-game titles as currently there seems to be very few of them. Also, most seem to be after accumulating multiple zone achievements. Why not have separate ones for each? I would think this would be fairly easy to implement as they are adding dyes to achievements already and with some achievements having titles already, it can't be too hard to copy from existing templates. Plus, lots of achievements are creatively named already. Examples:
Get killed by a Slaughterfish: Slaughtered! (pretty much the title)
Destroy 100 Dark Anchors from Coldharbour: Anchor Decimater (already titled this, why is there only a title for the last achievement?)
Discover all of the striking locales in the core regions of the Aldmeri Dominion, the Daggerfall Covenant, the Ebonheart Pact, and Coldharbour: Tamriel Trailblazer (already titled)
Loot any 50 Treasure Chests: Novice Lock-picker, or use the achievement title Treasure Chest Seeker