Here is the full list of all 24 SteamWorld Dig achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Find all secret areas in the caves.
Get all four gold stars in the same playthrough.
Find and sell 8 Uranium ores at the same time.
Dig out 15000 tiles.
Destroy a laser box.
Complete the game with more than 20000 gold collected in total.
Complete the game with more than 150 orbs collected in total.
Complete the game without getting killed once.
Crush 10 enemies with falling blocks.
Destroy two generators before entering Vectron.
Defeat a turtle submerged in water.
Maximize all upgrades.
Find and sell 16 Dark Matter ores at the same time.
Defeat 10 mecha trilobites before they wake up.
Buy from all of Tumbleton's shops.
Complete the game in less than 2 hours, 30 minutes.
Immortalization of a destructible steambot.
Reach the bottom of the world.
Defeat 10 shiners before they wake up.
Find and sell 8 Trashium ores at the same time.
You found Vectron!
You found the Old World!
Defeat 10 trilobites before they wake up.
You found Archaea!