Here is the full list of all 55 Pixel Puzzles 2: Space achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
21 Puzzle Launch
15 Puzzle Launch
9 Puzzle Launch
23 Puzzle Launch
16 Puzzle Launch
17 Puzzle Launch
Complete All Puzzles
25 Complete Puzzle
25 Puzzle Launch
10 Puzzle Launch
18 Puzzle Launch
12 Complete Puzzle
12 Puzzle Launch
6 Puzzle Launch
20 Complete Puzzle
20 Puzzle Launch
2 Puzzle Launch
19 Complete Puzzle
19 Puzzle Launch
8 Complete Puzzle
8 Puzzle Launch
4 Puzzle Launch
22 Complete Puzzle
22 Puzzle Launch
13 Complete Puzzle
13 Puzzle Launch
5 Puzzle Launch
1 Puzzle Launch
7 Complete Puzzle
7 Puzzle Launch
14 Complete Puzzle
14 Puzzle Launch
24 Complete Puzzle
24 Puzzle Launch
11 Complete Puzzle
11 Puzzle Launch
3 Puzzle Launch
5 Complete Puzzle
Launch Location Satelite
Launch Rotation Satelite
17 Complete Puzzle
Launch Ghost Satelite
21 Complete Puzzle
15 Complete Puzzle
16 Complete Puzzle
23 Complete Puzzle
9 Complete Puzzle
18 Complete Puzzle
1 Complete Puzzle
2 Complete Puzzle
6 Complete Puzzle
10 Complete Puzzle
3 Complete Puzzle
4 Complete Puzzle
Completet DL Launcher Puzzle