I noticed that some of the achievements also give you a perk when you complete them.

Like Lord Death (kill 200 of anything) gives you a perk that nets you like 10% more damage dealt to everything (because, like it says, "you like killing everything.") The bug killing one has a perk, too. But these are the only ones I've seen. I haven't gotten all of them, though, so I don't know how many have associated perks.

Could someone give me a list of achievements/challenges that give a perk, and what the perk does?