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