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