Here is the full list of all 25 Pangman achievements.
Get a x5 streak
Get a x10 streak
Get a x15 streak
Get a x20 streak
Destroy 5 spheres using the time power-up
Destroy 10 spheres using the time power-up
Defeat the master Sphere
Destroy 5 spheres using the shotgun power-up
Destroy 10 spheres using the shotgun power-up
Destroy 5 spheres using the Laser power-up
Destroy 10 spheres using the Laser power-up
Get all the achievements