Here is the full list of all 31 Fairy Knights achievements.
Fire magic earned!
5 Combo!
Elisa joined the party!
Wow! Several Combo!
1st weapon upgraded!
4 Combo!
1st Skill level up!
1st Item bought!
1st Level up!
3 Combo!
2 Combo!
A beginning of the journey.
Earned a weapon!
Digi joined the party!
1st battle completed!
First magic!
Earth magic earned!
About Aru!
Forest magic earned!
Wind magic earned!
Defeated Taringus!
Earned the legendary sword!
Have seen the ending of the game!
Have revived!
Perfect warrior!!
Full level warrior!
Fire wizard!
Water wizard!
Earth wizard!
Forest wizard!
Wind wizard!