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.
Finish the game obtaining the Alternative Ending.
Defeat Ergo and The Bearer in the Nexus.
Defeat the Secret Boss.
Defeat the Shadow of the Nameless.
Obtain the Thanathos Nekrom.
Defeat the three guardian shadows.
Defeat Nascal the Puppetmaster.
Unlock the access to the Inner Halls of Arcane.
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.
Defeat Druaga.
Help the Priest of Erynes.
Reach Arcane.
Finish the prologue.
Finish the game in New Game+.
Find all the hidden items in Arcane.
Reach Level 16.
Find all the fragments of Velez’s Soul.