Here is the full list of all 16 Matchsticks - there are Coffee Break Club achievements.
Finish all levels
Unlock all achievements
Find a secret solution in level 57
Complete 50 levels
Complete 15 consecutive levels without losing
Complete one level in each theme
Replay a completed level
Click on the matchbox 50 times
Lose the same level 5 times
Restart a level 5 times
Complete 25 levels
Complete 10 levels
Lose the game once
Complete one math level
Restart a level once
First level completed