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Cy Young is the answer, but nobody mentioned the right record.

749 complete games.

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Wow, yeah this is the one. I also like the Tatis record because being in the situation of hitting three times in an inning is rare, add that to having the bases loaded each time, add that to hitting a home rune each time = impossible.
My friend suggested that Randy Johnson's record of most birds killed with a fastball in an inning is pretty safe as well.

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We have to keep in mind that some of these records (like the one Tatis has with two grand slams in an inning) are different from the others.

With some of the longer records that speak to excellence and/or durability (i.e Gretzky, Rose, Cy Young, etc), at least an upcoming player can strive towards these. Crosby can try to break some of Gretzky's records, and he might get close to a couple (though I doubt it).

With a record like Tatis', though, it's not possible to practice for it, or strive for it, or improve your game for it. If by some freak of nature it got broken, it could just as likely be by an Alex Rios as an Albert Pujols. I mean it's a cool record to have, but it happened because the stars were aligned just right, unlike the excellence over time records that are mentioned on this thread.

It would be nice to have some categories.

1) Lifetime acheivement records that won't be broken
2) Amazing seasons - records from one season that won't be broken.
3) Amazing games - records from one game that won't be broken
4) Other - (such as the Tatis record)