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.
Change side more than 50 times in one session
Let the twin crash right after spawning it 5 consecutives times in a game.
Get 2000 points in one session
Get 800 points in Twins mode in one session
Get twins mode 75 times
Collect 500 coins
Make a jump that leads to a certain death, but get some coins in your way!