Here is the full list of all 15 Nevultra achievements.
Complete area: Angelica
Complete area: Vanakis
Complete area: Laragon
Complete area: Polaris
Complete area: Zodiac
Complete area: Nebula
Complete area: Aleph
Complete area: Xatura
Complete area: Minerva
Get 1,000,000 points.
Get 5,000,000 points.
Get 10,000,000 points.
Complete the orb collection.
Beat the game without using any continues.