Here is the full list of all 47 Odyssey of Gianna achievements.
Recruit Jyla.
Recruit Nuan.
Recruit the Commoner.
Recruit Alisha.
Recruit Yterre.
Recruit Annie.
Recruit Samona.
Obtain the Green Tome.
Obtain the Green Jewel.
Obtain the Blue Tome.
Obtain the Blue Jewel.
Obtain the Red Tome.
Obtain the Red Jewel.
Obtain the Yellow Tome.
Obtain the Yellow Jewel.
Obtain the White Tome.
Obtain the White Jewel.
Obtain the Black Tome.
Obtain the Black Jewel.
Obtain the "Pure Queen" ending.
Obtain the "Paradise" ending.
Obtain the "A Deal, Struck" ending.
Obtain the "Legacy" ending.
Complete the Status Journal.
Complete the Bad End Journal.
Obtain the Red Jewel without fighting a boss.
Help Vorosess find Jatek.
Help open a Soulgem Shop in West Beach.
Defeat Hessa and Pollur in their private room.
Defeat Gambler without using the roulette.
Inflict Sinian with Egghole.
Gain Spirit Yuusei.
Have all reinforcements arrive against Lust.
Defeat Mrs. Sanguine.
Defeat Ripvannibala.
Defeat Rokkas the Hero.
Clear Boss Challenge I.
Clear Boss Challenge II.
Clear Boss Challenge III.
Clear Boss Challenge IV.
Clear the Boss Rush.
Bring the Red Jewel and Red Tome to the Hall of Orbs.
Bring the Blue Jewel and Blue Tome to the Hall of Orbs.
Bring the Green Jewel and Green Tome to the Hall of Orbs.
Bring the Yellow Jewel and Yellow Tome to the Hall of Orbs.
Bring the White Jewel and White Tome to the Hall of Orbs.
Bring the Black Jewel and Black Tome to the Hall of Orbs.