Here is the full list of all 16 While you are Downloading achievements.
Earn 5,000 points in a single round
Earn 10,000 points in a single round
Earn 15,000 points in a single round
Earn 20,000 points in a single round
Earn 25,000 points in a single round
Stay alive for 1 minute
Stay alive for 90 seconds
Earn 10,000 points in a single round with 2 Players
Earn 20,000 points in a single round with 2 Players
Earn 30,000 points in a single round with 2 Players
Earn 40,000 points in a single round with 2 Players
Earn 50,000 points in a single round with 2 Players
Stay alive for 100 seconds in 2 Players mode