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