Watch paint dry

Basically, this game was created by a hacker to show Valve a security flaw that allowed people to publish games without going through the Steam Greenlight process (the system at the time). Read more about it here: https://medium.com/swlh/watch-paint-dry-how-i-got-a-game-on-the-steam-store-without-anyone-from-valve-ever-looking-at-it-2e476858c753

The game itself could be considered to be a visual novel. There are a couple choices in the game, however, no matter which you pick, you will end up with the same conclusion. All three achievements pop along the way of completing the game (which only takes 1 minute if you skip through it, but even then takes 2 if you read it too; it's really that short).

These achievements are all actually trackable, but it does require a non-traditional workaround involving looking at your Steam profile "favorite game" showcase (which you can put WPD in). If you own it, completionist.me and Steam Hunters are both able to track it. Awesome stuff!