Here is the full list of all 14 The Last Aura achievements.
Unlock the bad ending
Unlock the good ending
Escape from Amatus
Defeat Amatus
Defeat Lyssa
Defeat Maynos
Defeat Salirya
Find your first Pledge Crystal
Collect all Light Prisms in a stage
Find all the Pledge Crystals from stages 1 to 5
Find all the Pledge Crystals from stages 6 to 10
Find all the Pledge Crystals from stages 11 to 15
Find all the Pledge Crystals from stages 16 to 20
Find all Pledge Crystals