Here is the full list of all 8 Unity Pomodoro achievements.
Unlock your first pomodoro/tomato.
Unlock your first long break.
Flicker the theme slider 10 times quickly.
Run your timers for a total of 24 hours. (86,400 seconds)
Skip your first timer.
Unlock 32 pomodoros/tomatoes.
Dispose of 8 pomodoros/tomatoes.
Change the number of pomodoros required to achieve a long break.