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.
Complete All Puzzles
22 Complete Puzzle
22 Puzzle Launch
24 Complete Puzzle
24 Puzzle Launch
23 Complete Puzzle
23 Puzzle Launch
20 Complete Puzzle
20 Puzzle Launch
19 Complete Puzzle
19 Puzzle Launch
18 Complete Puzzle
18 Puzzle Launch
14 Complete Puzzle
14 Puzzle Launch
21 Complete Puzzle
21 Puzzle Launch
8 Complete Puzzle
8 Puzzle Launch
15 Complete Puzzle
15 Puzzle Launch
25 Complete Puzzle
25 Puzzle Launch
7 Complete Puzzle
7 Puzzle Launch
12 Complete Puzzle
12 Puzzle Launch
6 Complete Puzzle
6 Puzzle Launch
11 Complete Puzzle
11 Puzzle Launch
13 Complete Puzzle
13 Puzzle Launch
5 Complete Puzzle
5 Puzzle Launch
9 Complete Puzzle
9 Puzzle Launch
17 Complete Puzzle
17 Puzzle Launch
1 Complete Puzzle
1 Puzzle Launch
16 Complete Puzzle
16 Puzzle Launch
2 Complete Puzzle
2 Puzzle Launch
3 Complete Puzzle
3 Puzzle Launch
10 Complete Puzzle
10 Puzzle Launch
Completet DL Launcher Puzzle
4 Complete Puzzle
4 Puzzle Launch
Launch Rotation Satelite
Launch Location Satelite
Launch Ghost Satelite