Here is the full list of all 13 Stupid Space Shooter achievements.
Reach level 15
Reach level 30
Reach level 45
Reach level 60
Reach level 75
Reach level 90
Reach level 105
Reach level 120
Reach level 135
Reach level 150
Destroy 100 Elites
Do a total of 100 runs
Gain 150000 XP