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You get the achievement "Evocation" automatically when Luthedor appears.

Save #1 at the choice between "According to the rules..." and "The reliability of the story..."

Choose: "According to the rules, the reliability of the story shouldn't be doubted." You get the achievement "Prince of Guilt" for this.

Choose: "I'm fully responsible for all consequences of the contract." You get the achievement "The Knight of the Wand" at the end of the battle.

Read all books in the library and choose "I have no time for this" when there are no books left.

You automatically get the achievement "Brilliant Pawn" during the flashback battle.

Save #2 at the choice between "Tremoise fought thinking only..." and "Do not deny that..."

Choose: "Do not deny that the whole battle is a metaphor."
Choose: "Tremoise could exist as an illusion and a reality at the same time." You get the achievement "Golden Dogma" during the battle and "The Wizzard" and "First Blood" at the end of the battle.

Read all books in the library and choose "I have no time for this" when there are no books left. You get the achievement "Disciple of Transcendence" for this.

Save #3 at the choice between "Aurora", "Theodor" and "Friedrich".

Choose: "Aurora"
Choose: "Theory is now questionable". For this, you get the achievement "Unbeliever" and the ending "The Ending of Shoso".

Load Save #3

"Aurora"
"The theory still holds good"
"Aurora"
"Candide conceded defeat in this route"
"Aurora"
"Yes, there is no room for doubt in this game"

You get the achievements "The Valiant Knight-Mage" and "The Golden Seeker" at the end of the battle.

Save #4 at the choice between "I wish to become a Transcendent" and "I wish to start a new life".

Choose either of them and after the end, load Save #4 and choose the other one. You get the endings "The Ending of Transcendent" and "The Ending of Teophil" for these choices.

Load Save #2

"Tremoise fought thinking only of the effectiveness of his own moves"
"Tremoise cannot be an illusion and reality at the same time". You get the achievement "Pacifist" and the ending "The Ending of Pacifist" at the end.

Load Save #1

"The reliability of the story is not proved with evidence"
"Luthedor had no right to do so with his own client"

Save #5 at the choice between "Accept" and "Refuse".

Choose: "Accept" to get the achievement "Dodger".

Save #6 at the choice between "The Scarlet Fortress cannot exist..." and "Keep silent".

Choose: "The Scarlet Fortress cannot exist without enmity!" to get the ending "The Ending of Dead Fox"

Load Save #6

Choose: "Keep Silent" to get the achievement "The Purple Demon".

Save #7 at the choice between "Demonic nature" and "Human nature".

Choose either of them and after the end, load Save #7 and choose the other one. You get the endings "The Ending of Archicerberus" and "The Ending of Matthaus" for these choices.

Load Save #5

"Refuse"
"Have you ever had a creature you could call a friend?"
"Who is closer to you in the stories: the protagonist or the antagonist?"
"Was the summoning of the Knight of the Lion done out of feeling superior?"

Save #8 at the choice between "Accept" and "Refuse".

Choose: "Accept".

Save #9 at the choice between "Revolver" and "Marigold".

Choose "Revolver" to get the achievement "Golden Murderer" and the ending "The Ending of Chaos".

Load Save #9

Choose: "Marigold" to get the achievement "The Nature of Eternity".

Save #10 at the choice between "Stop the agony" and "Continue the agony".

Choose either of them and after the end, load Save #10 and choose the other one. You get the endings "The Ending of Theodor" and "The Ending of Dianen" for these choices.

Load Save #8

Choose: "Refuse".

Save #11 at the choice between "Aurora", "Theodor" and "Friedrich".

Choose: "Aurora."
Choose: "Theory is now questionable" to get the ending "The Ending of Shoso".

Load Save #11

"Aurora"
"The theory still holds good"
"Theodor"
"Luthedor could not believe in all these dogmata at the same time"
"Friedrich"
"Candide accepted the argument, everything else is irrelevant"

Save #12 at the choice between "The Scarlet Fortress..." and "Do I believe?"

Choose: "Do I believe?" to get the achievement "New Prince" and the ending "The Ending of Hope".

Load Save #12

Choose: "The Scarlet Fortress is just an illusion" to get the achievement "Spirit Slaughterer". At the end, you get the ending "The Ending of Ruin" and the achievement "The Wizard of Dimensions" for unlocking all endings.