Here is the full list of all 14 CORPSE FACTORY achievements.
Forge a bond with Aoi.
Clear the bonus mode.
Unlock the hell ending.
Unlock the true ending.
Clear the game.
Unlock the false ending.
Unlock the bonus ending.
Complete the final act.
Complete Act III.
Complete Act II.
Complete Act I.
Forge a bond with Shinya.
Forge a bond with Tomoe.
Complete the prologue.