SteamWorld Build
28 Achievements
GOG
Up, Up And Away!
Launch the Rocket.
16.3%
How to unlock the Up, Up And Away! achievement in SteamWorld Build - Definitive Guide
SATCONCook
TrueAchievements
TrueAchievements
This is from completing any map on any difficulty other than sandbox. Once you have a road connected to the rocket, a warehouse nearby and enough rocket fuel to fuel it up, it will say ready. Just select the rocket and launch!