Here is the full list of all 20 Nyan Cat: Lost In Space achievements.
250 enemies eliminated with Nyan Love
Jumped on Gold Platforms 1000 times
2000 bombs deactivated
100 Cow items collected
Played 10 times on Nyan Cat City theme
Played in a world other than Space
5 times jumped over a doggy in a game
A UFO abduction survived 100 times
20 enemies eliminated with Nyan Love
Ran 25 seconds without collecting any food
42195 meters completed
x250 score multiplier reached in a game
Tac Nayn touched 9 times
Stayed on the highest platforms at least for 30 seconds
100 bombs deactivated
5 pills collected in a game
Played with a skin other than NYAN CAT
Ran 1000 meters without touching any kind of enemies
Stayed on the lowest platforms at least for 30 seconds
A UFO abduction survived