Here is the full list of all 7 Twins achievements worth 200 gamerscore. It takes around 3-4 hours to unlock all of the achievements on Windows Phone.
Get 800 points in Twins mode in one session
Change side more than 50 times in one session
Collect 500 coins
Get twins mode 75 times
Get 2000 points in one session
Make a jump that leads to a certain death, but get some coins in your way!
Let the twin crash right after spawning it 5 consecutives times in a game.