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