Hello and welcome to the forums, tremplaya.
There is a
list of augmentations on this site but it isn't specific on which augmentations are effective on which monster (try looking around at
GameFAQs).
I remember that Hobbes are weak against fire, hence the flame augmentations, silver is effective against the undead and Balverines. As for lightning, I can't remember but someone on this site mentioned pixies as being weak against it.