Here is the full list of all 21 Space Ranger ASK achievements.
You shot 1000 UFOs! Nice!
You destroyed 5 bosses
You Published your first Mission to Steam Workshop
You created your first Mission
You shot 1000 Asteroids
You collected 100 Coins
You shot 100 UFOs
You completed your first Mission
You succesfully launched the game! Yay!
You shot 100000 Asteroids! Awesome!
You shot 10000 UFOs! Awesome!
You rescued 100 Spacemen!
You rescued 500 Spacemen! You are a true hero!
You rescured 1000 Spacemen! You are a Legend!
You collected 1000 Coins
You destroyed 10 bosses
You destroyed 50 UFO Bosses! You're a true space hero!
You shot 10000 Asteroids
You collected 10000 Coins
You completed 10 Missions
You completed 50 Missions