Here is the full list of all 14 SteamWorld Dig (JP) trophies - there are 12 bronze, 1 silver and 1 gold.
Destroy two generators before entering Vectron.
Find all secret areas in the caves.
Defeat a turtle submerged in water.
Complete the game without getting killed once.
Get all four gold stars in the same playthrough.
Complete the game with more than 20000 gold collected in total.
Complete the game in less than 2 hours, 30 minutes.
Complete the game with more than 150 orbs collected in total.
Immortalization of a destructible steambot.
Maximize all upgrades.
Reach the bottom of the world.
You found Vectron!
You found the Old World!
You found Archaea!