Here is the full list of all 20 Quaddro 2 achievements.
Make your frist square
Group up 9 dots to make a big square
Group up 2 squares at the same time
Make 3 squares at the same time
Make four squares at the same time
Getting the hang of it, Beat 10 levels
Beat 20 levels
Complete 30 levels
Complete 40 levels
Complete 50 levels
Complete 60 levels
Complete 70 levels
Complete 80 levels
Complete the clock tutorial level
Complete the barrier tutorial level
Score 1000 points
Starting from the frist level beat the game in less than 1 hour
Beat half of levels
Beat the game
Complete the swap tutorial level