Here is the full list of all 44 Distant Space achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
You are mistaken
The last boss is dead
You have completed the level 26
Complete all levels
You have completed the level 25
You have completed the level 24
You have completed the level 23
You have completed the level 22
You have completed the level 21
The second boss is dead
You have completed the level 20
You have completed the level 19
You have completed the level 18
You have completed the level 17
You have completed the level 16
You have completed the level 15
You have completed the level 14
You have completed the level 13
You have completed the level 12
You have completed the level 11
You have completed the level 10
The first boss is dead
You have completed the level 10/10
You have completed the level 9
You have completed the level 9/10
You have completed the level 8
You have completed the level 8/10
Perish for the first time
You have completed the level 7
You have completed the level 7/10
You have completed the level 6
You have completed the level 6/10
You have completed the level 5
You have completed the level 5/10
You have completed the level 4
You have completed the level 4/10
You have completed the level 3
You have completed the level 3/10
Complete the level without damage
You have completed the level 2
You have completed the level 2/10
You have completed the level 1
You have completed the level 1/10
Start game