Reach the Stratosphere Achievement in Goat Simulator 3

While there may be multiple ways to do this, the way I did it was to equip the jetpack and then just press  and wait for it to take you up and out of the map. When you respawn, this achievement will unlock.

The jetpack is located at the top of the smokestacks of the Pointy Foods Factory in the eastern section of Fairmeadows Ranch. You'll have to platform and bounce your way to the top, but nothing crazy.