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 Act III.
Complete the final act.
Complete Act II.
Complete Act I.
Forge a bond with Shinya.
Forge a bond with Aoi.
Forge a bond with Tomoe.
Complete the prologue.