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