Here is the full list of all 23 Alluna and Brie achievements.
Entered the Frakk behind LiCastro Manor.
Beat Eldoris.
Beat the boss of Chapter 1.
Beat the boss of Chapter 2.
Beat the boss of Chapter 3.
Beat the boss of Chapter 4.
Beat the boss of Chapter 5.
Finish the game.
Defeat Hubert, the most powerful entity in Axon City.
Watch 100 episodes of Max Heart Minute.
Capture all InsectiVirus insects.
Clear the bonus chapter.
Reach HB Rank 8 with Alluna.
Reach HB Rank 8 with Victoria.
Reach HB Rank 8 with Lorilynn.
Reach HB Rank 8 with Eldoris.
Reach HB Rank 8 with Evelyn.
Reach HB Rank 8 with Natara.
Reach HB Rank 8 with Max.
Reach HB Rank 8 with Ember.
Reach HB Rank 8 with Holly.
Reach HB Rank 8 with Demetrius.
Win all fights at the ACYC.