Here is the full list of all 14 CORPSE FACTORY achievements.
Unlock the hell ending.
Unlock the false ending.
Clear the bonus mode.
Clear the game.
Unlock the true 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.
Forge a bond with Aoi.
Complete the prologue.