Here is the full list of all 49 Regalia: Of Men and Monarchs achievements.
Vanquish the Fomorian Ancient.
Vanquish the Visage of Anguish.
Clear 15 Dungeons.
Max out Miri's Personal Bond.
Max out Henrietta's Personal Bond.
Max out Aliss' Personal Bond.
Max out Haksun's Personal Bond.
Max out Signy's Personal Bond.
Fish out the legendary item.
Max out Riehl's Personal Bond.
Max out Winter's Personal Bond.
Complete the game. Thanks for playing!
Max out Grenn's Personal Bond.
Max out Valen's Personal Bond.
Max out Diego's Personal Bond.
Max out Baz and Lilka's Personal Bond.
Max out Theo's Personal Bond.
Unlock 30 Codex entries.
Complete Chapter 6.
Reach Party Level 20.
Craft 100 items.
Win 50 battles.
Complete Chapter 5.
Max out Levant's Personal Bond.
Complete 25 Text Adventures.
Max out Gunther's Personal Bond.
Complete Chapter 4.
Complete 50 challenges.
Craft 25 items.
Successfully placate the three feuding parties.
Win the negotiations by eliminating both Tag and Bink.
Win the negotiations by exposing Bink.
Win the negotiations by exposing Tag.
Max out Griffith's Personal Bond.
Max out Mifune's Personal Bond.
Max out Esther's Personal Bond.
Complete Chapter 3.
Reach Party Level 10.
Complete Chapter 2.
Catch 25 fish.
Fish out 10 items.
Clear 3 Dungeons.
Carry on the legacy of the fallen hero.
Max out Shichiroji's Personal Bond.
Complete Chapter 1.
Complete 5 challenges.
Unlock 5 Codex entries.
Complete a Text Adventure.
Win your first battle.