Not really an "achievement" but I used to know the key stats of the major unique items in Diablo 2, as well as how to make most relevant Runeword gear and what they were good for.
Now I have to look that crap up other than like 5 of them.
Bosses are immune to the eat command so it won't be possible to end the final boss fight of the game by eating it.
-VeghEsther