Fetch quests have long been hated in RPGs. Not to worry, though, as getting the Go Fetch achievement is not nearly as annoying as fetch quests. While it is rather simple to unlock, the first opportunity to get this achievement doesn't happen until you arrive in Two-Town. Therefore, the first step toward you obtaining Go Fetch is making it to Two-Town.
To get the Go Fetch achievement, you will need to send Dicey through a Dice Door. These doors look an awful lot like doggy doors and function like them, too. Walk up to a Dice Door and interact with it to send Dicey through. Don't worry—Dicey will return to you.
Related: How to use cards in Lost in Random
The Go Fetch achievement is completed when you first use a Dice Door. In Two-Town, when you reach the first sign, head to the right towards Two-Way Street, Seller Street, and Two-Town Square. You will come across another sign. Head down the alley that leads you This Way.
You will see the Dice Door set in the wall. It will have a glowing one-side of a dice. Once you send Dicey through the Dice Door, you will earn both the achievement and a large number of coins. If you missed this Dice Door, there are plenty scattered throughout Two-Town that are easy to spot.
For more information on Lost in Random, check out How to get the Dockworker Achievement in Lost in Random and How to get the Knock Knock Achievement in Lost in Random on Pro Game Guides.