Here is the full list of all 24 Piczle Cross Adventure achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
You got all trophies!
You cleared all Piczle Cross 2 puzzles
Made the developer answer for his crimes
You found the secret Score Studios room!
You cleared all regular puzzles
You reached the end of the story
You cleared all composite puzzles
You reached level 10!
You explored the whole map
You cleared 200 puzzles
You cleared 5 composite puzzles
You walked 3000 steps!
You unlocked 50% of the map
You cleared 100 puzzles
You reached level 5!
Catch one of everything
You read all the books in the library
You cleared 50 puzzles
You created your own puzzle theme
You used the clue roulette
You followed the tutorial
You cleared a composite puzzle
You cleared 10 puzzles
You leveled up!