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