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