Here is the full list of all 49 Cross Tails achievements.
Cleared Chapter 1 of the 'Kingdom of Ranverfurt' Story.
Cleared Chapter 6 of the 'Kingdom of Ranverfurt' Story.
Cleared Chapter 12 of the 'Kingdom of Ranverfurt' Story.
Cleared Chapter 17 of the 'Kingdom of Ranverfurt' Story.
Cleared Chapter 21 of the 'Kingdom of Ranverfurt' Story.
Cleared Chapter 22 of the 'Kingdom of Ranverfurt' Story (War Route).
Cleared Chapter 24 of the 'Kingdom of Ranverfurt' Story (War Route).
Cleared Chapter 27 of the 'Kingdom of Ranverfurt' Story (War Route).
Cleared Chapter 30 of the 'Kingdom of Ranverfurt' Story (War Route).
Cleared the Final Chapter of the 'Kingdom of Ranverfurt' Story (War Route).
Cleared Chapter 22 of the 'Kingdom of Ranverfurt' Story (True Route).
Cleared Chapter 24 of the 'Kingdom of Ranverfurt' Story (True Route).
Cleared Chapter 27 of the 'Kingdom of Ranverfurt' Story (True Route).
Cleared Chapter 30 of the 'Kingdom of Ranverfurt' Story (True Route).
Cleared the Final Chapter of the 'Kingdom of Ranverfurt' Story (True Route).
Cleared Chapter 1 of the 'Republic of Hidiq' Story.
Cleared Chapter 5 of the 'Republic of Hidiq' Story.
Cleared Chapter 13 of the 'Republic of Hidiq' Story.
Cleared Chapter 16 of the 'Republic of Hidiq' Story.
Cleared Chapter 22 of the 'Republic of Hidiq' Story.
Cleared Chapter 23 of the 'Republic of Hidiq' Story (War Route).
Cleared Chapter 24 of the 'Republic of Hidiq' Story (War Route).
Cleared Chapter 27 of the 'Republic of Hidiq' Story (War Route).
Cleared Chapter 31 of the 'Republic of Hidiq' Story (War Route).
Cleared the Final Chapter of the 'Republic of Hidiq' Story (War Route).
Cleared Chapter 23 of the 'Republic of Hidiq' Story (True Route).
Cleared Chapter 25 of the 'Republic of Hidiq' Story (True Route).
Cleared Chapter 28 of the 'Republic of Hidiq' Story (True Route).
Cleared Chapter 33 of the 'Republic of Hidiq' Story (True Route).
Cleared the Final Chapter of the 'Republic of Hidiq' Story (True Route).
Raised a unit's level to 99.
Learned/strengthened 256 skills.
Used Beast Skill 30 times.
Strengthened for the first time.
Exchanged a rare item for the first time.
Set a sub class for the first time.
Completed a free battle for the first time.
Changed class to Warrior.
Changed class to Knight.
Changed class to Heavy Knight.
Changed class to Priest.
Changed class to Cleric.
Changed class to Premier.
Changed class to Wizard.
Changed class to Mage.
Changed class to Summoner.
Opened 41 gold treasure chests in the 'Kingdom of Ranverfurt' Story.
Opened 47 gold treasure chests in the 'Republic of Hidiq' Story.
Dealt 9,999 damage in battle.