Here is the full list of all 25 Anima: Gate of Memories - there are The Nameless Chronicles achievements.
Finish the game in New Game+.
Reach Level 16.
Help the Priest of Erynes.
Find all the fragments of Velez’s Soul.
Unlock the Secret Ending.
Find all the hidden items in Arcane.
Defeat the Secret Boss.
Finish the game obtaining the True Ending.
Make Gaudemus create something for you.
Finish all possible conversations with Death.
Finish the game obtaining the Alternative Ending.
Defeat Ergo and The Bearer in the Nexus.
Defeat the Shadow of the Nameless.
Obtain the Thanathos Nekrom.
Defeat the three guardian shadows.
Free the prisoner from his prison.
Defeat Nascal the Puppetmaster.
Defeat Red Lady.
Unlock the access to the Inner Halls of Arcane.
Get the rank of Grand Maister in the Cathedral of Erynes.
Defeat Ergo and The Bearer in Erynes.
Defeat Rametek.
Defeat Druaga.
Reach Arcane.
Finish the prologue.