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