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