Here is the full list of all 12 IACTURA achievements.
Died to save the world
Reached a score above 100.000 on normal play-mode
Prevented 250 enemies from reaching the earth
Reached a score of 10.000 on normal play-mode
Prevented 20.000 enemies from reaching the earth
Scored 50.000 or more in hard mode
Scored 200.000 or more in hard mode
Defeated the miniboss with the cute look quadruply
Defeated the heavy-hearted miniboss thrice
Got 20 powerups
Reached a score of 140.000 on normal play-mode
Did not care at all