I know Yoshida said at one point he'd like to introduce titles into the game, so I thought I'd see what you guys wanted to see for certain in game actions.
Here is a list I've come up with for vanquishing the various notorious monsters:
Bardi – Bardi Basher
Quickfingers – Kokoroon Killer
Daddy Longlegs – Spider Squasher
Cactuar Jack – Pincushion
Nest Commander – Antling Incinerator
Pyrausta – Lizard Licker
Bomb Baron – Bomb Diffuser
Unknown Soldier – Bringer of Peace
Barometz – Weed Plucker
Slipper Sykes – Slug Slayer
Gluttonous Gertrude – Gertrude Griever
Old-Six Arms – Crab Crusher
Alux – Imp Instigator
Prince of Pestilence - Gnatswatter
Sirocco – Seasoned Hunter
Phaia – Boar Roaster
Jackanapes – Opo-Opo Oppressor
Queen Bolete – Fungus Fumigator
Downy Dusntan – Sheep Shearer
Spitfire – Spriggan Scolder
Dodore – Dodore Devastaor
Great Buffalo – Buffalo Hunter
Haughtpox Bloatbelly – Belly Buster
Elder Mosshorn – Mosshorn Mauler
Uraeus – Uraeus Usurper
Anyone got any other suggestions? Not necessarily just for killing NMs either, if you have a title suggestion for completing a certain quest or something let's hear it.