Beastiary.

[ebon wedge]

I assume Scavatore and Lucido ?
if so my tip for Scavatore is simply agro it away from its spawn until it starts running back so you can damage it without it going underground
as for Lucido just have a lot of dmg and spam heavy atk to stun it before it digs down

[languid plover]

You also need 30 kills of each non-elite before it will trigger. So it may be a case you are super close!

It would be beneficial to show a screen capture of your bestiary with the ??? so we can confirm which is missing.