Two issues here that I'm not sure are related:

1. My achievements aren't showing the InfernalMobs name that is in the lang file. Is there a way to either get the correct name to show or remove InfernalMobs from the achievements list entirely?

For reference, my lang file says this: "mobs.InfernalMobs_Illusioner.name=Infernal Illusioner"

2. My leaderboards don't show InfernalMobs kills unless I add the different Infernal_mobname to the config. But, when I restart the server, the config file gets all of the mobs I added erased. I'd like for my InfernalMobs_Kills leaderboards to be able to track the mobs that are killed and for those mobs to remain in the config.

I can replicate the problem
I tried to rename "mobs.infernal_spider.name=Infernal sPIDEr222"
and create a leaderboard /mh leaderboard create infernal_spider222 alltime 3 3 1 and the result was like i expected. (And when I kill an infernal spider i counts one up.