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