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