Here is the full list of all 25 Anima Gate of Memories achievements.
Defeat a Memory Knight.
Finish the game obtaining the Worst Ending.
Finish the game obtaining the Bad Ending.
Finish the game obtaining the True Ending.
Finish the game obtaining the Early Ending.
Obtain the Joke Ending.
Reach Arcane.
Defeat Nascal the Puppetmaster.
Defeat Jonathan Kappel.
Defeat The Nameless Messenger for first time.
Defeat Druaga.
Defeat Malekith, the Lord of Nightmares.
Defeat the Secret Boss.
Find all items, weapons and artifacts.
Reach Level 20.
Finish the game in New Game+.
Obtain all Memories
Defeat Romeo Exxet.
Defeat for second time The Nameless Messenger.
Free all Prisoners.
Finish all possible conversations with Ergo.
Obtain the Angelus.
Give the Blood Stone to its owner.
Steal from the rich, give to myself!
Open the way to the upper floors.