Here is the full list of all 15 My Nuclear Octopus achievements.
Made it through level 1.
Scored 1,000 points.
Scored 10,000 points.
Scored 25,000 points.
Scored 50,000 points.
Scored 75,000 points.
Completed the game!
Died on the first level of the game.
Made it through level 10.
Made it through level 25.
Reached level 42!
Lost 20 total lives.
Defeated by the final boss.
Used the Nuclear Explodipus for the first time.
Reached the final boss.