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