Here is the full list of all 26 Dark Sauce achievements.
Complete 1st level
Complete 2st level
Complete 3st level
Complete 4th level
Complete 5th level
Complete 6th level
Complete 7th level
Complete 8th level
Complete 9th level
Complete 10th level
Complete 11th level
Complete 12th level
Complete 13th level
Complete 14th level
Complete 15th level
Complete 16th level
Complete 17th level
Complete 18th level
Complete 19th level
Kill the Dragon
Complete the game
Collect the first star
Collect the first gem
Collect the first heart
Find a slimes
Make friends with a little bird