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Like the name says, it replaces the achievement sound in the game, with the achievement sound from Door's Roblox game. Also, it has no special properties for completing the challenge, it's actually sound the same.
Here is a video, that discribes what the pack is doing.
This pack is created for one horror build, so you can use it too when going through the horror build!
That's it. If anyone wants it, I can release a full version that uses the sounds and textures from this game. But, I honestly don't know what for.

A simple resource-pack that replaces the achievement sound.