Monster, Number of groups required for Vanquisher (unlocks legendary), Illustration from Legendary,Legendary name, Legendary location
Werewuffie,30,025,God Handbast,Windy Canyon (Cave)
Contoad,30,046,Toad Ninjitsu,River Checkpoint
Dilizard,30,012,Mountain Grinder,Rivulet Hills (Guild of Heroes Cordon)
Slimebag,30,069,Waste Gorger,Hollow Gorge (Southern Cave)
Mischief,30,067,Sir Troublemaker,Western Lighthouse
Firewolf,30,066,Wolheim Howler,Crimson Forest (Cave near Howling Moon)
Wild Stinger,30,026,Queen Stinger,Grassland Road (Southern Cave)
Sylvan Fungus,30,051,Thorn of Fairlight,Lake Fairlight
Nectarfluster,30,081,Rainway Demon,Fellhorn Ruins
Venom Hornet,30,---,None,---
Dark Bat,30,065,Demonicon Eye,Nillia Woods
Bone Wanderer,30,037,Resurrected Baron,Colussia Sewers (North)
Broncallo,30,052,Nerophant,Royal Cottage
The Progression list says all Vanquisher titles unlock at 30, however some appeared to unlock at 25 (Werewuffie and Contoad). Some legendary names may not be the same as on screen. I forgot to write some of them down, and the code sometimes says something different. For example Demonicon Eye is "something Onehan" in the code.
Bugs
Earned Lake Fairlight cleared without opening the Ruby chest.
Lantern doesn't seem to work in newer caves at least.
Sometimes dice showing 2 + 4 are treated as a total of 5.
Windy Canyon cleared.
Dimensional Shards (the numeric bits are just map numbers)
002 Colussia (Center by house of guy who can't light a fire)
061 Colussia Sewers (Near Bolt Mail)
074 Port Ronod (Fish Market)
111 Grand Bridge (Second section, near exit)
120 Rivulet Hills (Western Contoad Cave)
124 Fellhorn Ruins (Empty Building in second area)
145 Darkthorn Keep (Western part of sewer between bridges)
154 Lake Fairlight (Island in area one east of entrance)
158 Western Lighthouse (Second floor)
166 Caimridge (Basement of town hall)
180 Windy Canyon (Werewuffie house)
189 Imperial Manor (North of paddock)
192 Highland Inn (North of paddock)
204 Nillia Woods (Campsite overlooking Darkthorn Keep)
210 Crystal Hall (Automatically given by Ilumi)
211 Grassland Road (On plateau patrolled by Wild Stingers)
220 Brightstone (Corner of building just east of the entrance)
245 Gentlemen's Club (Behind club, by well)
247 Summer Cove
263 Crimson Forest (North of Neifu camp)
Clearable areas
Port Ronod (Edit: Potentially bugged. See below.)
Rivulet Hills
Grand Bridge
Lake Fairlight
Western Lighthouse
Windy Canyon (Appears to be bugged. One of the required finds, Dimensional Shard by the Werewuffie house, increments Port Ronod's counter.)
Highland Inn
Nillia Woods
Grassland Road
Brightstone
Gentlemen's Club
Summer Cove
Royal Cottage
In general for Area Cleared Titles, Gabe checks for counter == somevalue in the code. If that's done for Port Ronod, you could lock it out by hitting somevalue when you get the bugged Shard in Windy Canyon. It won't try to award the Port Ronod title in Windy Canyon, and when you do collect the actual final item in Port Ronod, counter > somevalue won't trigger the title.
Edit: It's actually a little more insidious than that even.
Since that Dimensional Shard in Windy Canyon increments the counter for Port Ronod, if you were unlucky enough to find it before doing the very last thing that's actually in Port Ronod, a mismatch will occur. It might even be likely to happen because one of the cabinets in Port Ronod requires the Torsion Wrench (level 2 lockpick) reward that you can't get until later. What happens is that the collection's title listing checks for the Port Ronod counter to be equal to or greater than 14, and if it is, you get the star by that title. So if you get that shard, and it sets Port Ronod to 14, from that moment on, the collection will say you have the Port Ronod Cleared title, whether you got a message or not. However, when you're actually searching Port Ronod, in order to get the title message and increment the counts for areas cleared, titles earned, and explorer titles earned, the value must become exactly 14 as the script runs. So you search that last cabinet with Port Ronod's counter already set to 14, the script increments it to 15, and then you're out of luck when it checks to see if Port Ronod is equal to 14 to give you all the benefits of "clearing" the area.
Available Treasure Maps
01 Rivulet Hills
03 Windy Canyon
04 Nillia Woods
05 Crimson Forest (Near Howling Moon area)
Map 02 is inaccessible. However, the dig spot can be found and noted (not actually dug) in Caimridge near a tree outside the town hall.