Good idea! While we don't know game specifics yet we can still come up with some general ideas.
Completion
Finish the game
Finish the game on new game+
Familiar
Acquire your first familiar
Acquire all familiars
Weapons
Level up a weapon
Reach max level with a weapon
Reach max level with all weapons
We can all come up with general ideas like this and fine tune the list as we get alpha/beta access as the game goes on. Hopefully it will be a big help
