Here is the full list of all 6 Alien Hostage achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Good job.
Your first death. Don't rage just yet there is a lot more to see!
You have completed 5 levels!
You have completed 15 levels!
You have died 20 times. Congrats on still being here!
You have completed 25 levels!