Here is the full list of all 15 Calcul8² achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Used 2 buttons to reach 0.
Used 3 buttons to reach 0.
Used 4 buttons to reach 0.
Used 5 buttons to reach 0.
Used 6 or more buttons to reach 0.
Won more than 25 times in a row.
Won more than 50 times in a row.
Lose more than 5 times in a row.
Cleared your selection using 'C'
Reset the current goal using 'CE'
Quicksaved the game using '💾'
Reoaded the game using '📁'
Scored over 1,000 in a single run.
Scored over 10,000 in a single run.
Scored over 100,000 in a single run.