Here is the full list of all 20 Space God achievements.
500 Accumulate 500 star coins
Achieve a 500-Hits
Retry the stage for the first time
Register your score to the leaderboard
Clear the stage for the first time: Normal
Achieve a 100-Hits
Clear all stages on Normal difficulty
Clear stage without damage
Clear the stage without killing the enemy.
Acquire 50 star coins in one stage
Achieve a 1000-Hits
Activate the 'Light Block' 100 Times.
Clear the stage for the first time: Hard
Clear the stage for the first time: Insane
Clear all stages on Hard difficulty
Clear all stages on Insane difficulty
Clear all stages on Challenge mode
First Unlock Vehicle
Upgrade weapons 10 times
Accumulate 10000 star coins