Here is the full list of all 12 Steel Knight 1513 achievements.
AZTEC LEVEL COMPLETED
BONUS SKELETON LEVEL 10 COMPLETED
ARIZONA LEVEL COMPLETED
YOU SEEN THE LAST LEVEL
NEBRASKA LEVEL COMPLETED
TEXAS LEVEL COMPLETED
NORTH DAKOTA LEVEL COMPLETED
AZTEC BONUS COMPLETED
NEBRASKA BONUS COMPLETED
BONUS SKULL LEVEL 10 COMPLETED
BONUS LEVEL 12 COMPLETED
GAME COMPLETED