The Unauthorized Passenger achievement is a hidden task you can complete in Potato Please to get the completionist tag. While unlocking the achievement isn’t a strict condition (to end the game), it truly feels like a challenge.
In this guide, I will help complete the achievement without any issues.
Potato Please Unauthorized Passenger walkthrough
Unlike all other achievements in Potato Please, the game doesn’t provide you with any description for the Unauthorized Passenger challenge. The only way to know about it is to complete the challenge.
Once you know what needs to be done, unlocking the achievement becomes easy. To unlock the achievement, you’ll first need to get the Sack Cableway automation from the available upgrades. It’s an expensive one, and there are several prerequisites. Hence, it’s best to save this achievement for the late game.

The Sack Cableway automatically picks sacks of potatoes when you place them next to it. To complete the achievement, wait for it to pick up a sack of potato. Once it does so, go to the sack and press the E button.
Getting hold of the sack lifts you in the air, and the machine carries you over a distance. This will complete the Unauthorized Passenger achievement.
This is the only way of completing the achievement. If you try to jump on the sack, the Sack Cableway will fail to pick it up. Hence, that’s not going to work.