The "data.sav" file contains not only 100% of my unlocked achievements, but also my personal game settings. I recommend making a full backup of the "SaveGames" folder before replacing it.
In-game achievements also unlock new items for purchase in your worlds.
A quick way to open the saves folder:
Press Win + R on your keyboard
Paste the following into the input field: %localappdata%\VotV\Saved\SaveGames
Press Enter or click "OK"
Author: Gilsy