Here is the full list of all 20 Angry Birds Space (Windows) achievements worth 200 gamerscore.
Smash 500 000 blocks
Angry Birds Space played for 30 hours
5000 birds launched
500 pigs freezed
5000 stone blocks smashed
Angry Birds Space played for 15 hours
50 000 blocks smashed
5000 ice blocks smashed
5000 wooden blocks smashed
1000 bubbles popped
250 stars earned
1000 pigs smashed
100 birds exited atmosphere
6 pigs scared with one green bird
3 pig freezes with one ice bird
Angry Birds Space played for 5 hours
Pig popped with another pig
100 pigs popped in the main menu
Bird shot into a lagrangian point
All credits name bubbles popped