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