10 Rarest Xbox Achievements

10. Bat Trick - Crypt Of The NecroDancer

Rarity: 0.15%

Getting Bat Trick requires you to kill three green bats. That's it. That's all you have to do. Compared to the game's insane solo and challenge runs, this seems absolutely easy... right?

Well, it's actually kind of the opposite. Because these green bats are some of the rarest enemies in the entire game, making hunting them down insanely difficult because they just outright don't show up.

Indeed, the developers eventually confirmed that these emerald enigmas appear at roughly a rate of one every four hundred enemies, meaning getting three green bats in one thousand two hundred enemies can actually be considered a lucky result.

What's especially amazing about this is that you could be a flawless player of this incredibly challenging game, and still find yourself unable to get this one pesky achievement just because of simple bad luck.

While nobody likes being handed achievements without doing a little work for them, fighting hundred and hundreds and enemies for the privilege of fighting a measly small green bat doesn't exactly sound like a thrilling experience.