Here is the full list of all 12 Fillit achievements.
Disable 50 shooting cannons
Kill 60 enemies
Almost died 15 times
Completed level on the last second
Collected 100 Stars
Collected 50 Flags
Collected 20 Keys
Occupied All Territory
Killed 5 enemies in one level
Completed all Easy levels
Completed all Normal levels
Completed all Hard levels