Here is the full list of all 13 Reptilian Rebellion achievements.
Collect 10 Bitcoins
Kill the Pop Star, in her sport car
Destroy 5 Hell Riders
Kill 5000 reptilians
Kill 2500 reptilians
Kill at least 20 reptilians with an Hydrogen bomb
Destroy 10 Swat Vehicles
Kill 1000 reptilians
Find the Illuminati Leader in his limousine and send him to hell
Kill 500 reptilians in a game with RON
Survive 5 Chem Trails
See an UFO
Collect 25 Bitcoins