Here is the full list of all 16 Axial Disc 1 achievements.
Defeat the final boss on Spinel Difficulty!
Find the Pew Ball!
Speak to the man behind the truck.
View the secret ending
Defeat Tefka
Defeat Lion
Reach level 20 [C]afe Sai!
Acquire KING's Phone!
Defeat Raye
Reach the top floor of Hotel Bluewood!
Defeat Chip in the Cathedral!
Defeat Chip in Chip's Room!
Find the Trash Can with an item in it!
Challenge Relggiw!
Reach the top of Yggdrasil
Find all four Elemental Robots!