SteamWorld Build
28 Achievements
GOG
Steam Powered
Have 40 Refineries boosted by Steam.
10.7%
How to unlock the Steam Powered achievement in SteamWorld Build - Definitive Guide
You can get this by building a lot of charcoal factories (or similar low demand buildings) and I found it simplest to do right before launching the rocket. Resources shouldn't be an issue at that point but if they are you can demolish excess factories as soon as the achievement pops.
If you build all your factories/refineries in one area, leave a little 3x3 space in the middle of them where you can place the Steam Furnace once you have it unlocked and this will pop pretty quickly.