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