Here is the full list of all 50 PLANETS OF WAR achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Check The Pause Menu
Change The Firemode
Check the options
See The Credits
Finish The Game
Kill The End Boss
Start Level 4
Destroy The Alien Planet
Destroy The Enemys Spacestation
Make 2000 Hits
Destroy The second Mothership
Start Level 3
Destroy an asteroid
Destroy The First Mothership
Make 1000 Hits
Make 500 Hits
Start Level 2
Make 250 Hits
Make 200 Hits
Make 100 Hits
Make 50 Hits
Make 5 Hits
Kill a Enemy
Start Level 1
Start The Game