Just a couple weeks ago I crafted my Legendary Amulet for around 1,5k Gold.
With the new achievement you can get it now basically for free and sicne you only need 1 in the legendary armory the crafted ones ar for nothing.
My suggestion is: Let us choose a Legendary trinket for the achievement: an amulett, a ring or an accessoire
So every player can get something usefull and have fun hunting the achievement 🙂