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