You can now find out Dark Souls II enemy death stats by visiting the Beyond the Portal website, just beware that this data does not include boss fights.
In additions, it appears that the developer intends to add a tab that will be dedicated to boss kills and defeats soon, as well as another tab for multiplayer.
You can also take a look at the Dark Souls II television commercial that made an appearance during The Walking Dead Finale.
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Source: Dark Souls II