Here is the full list of all 20 Angry Birds Space (Windows) achievements worth 200 gamerscore.
Pop all name bubbles in credits
Shoot a bird into a lagrangian point
Smash 5000 wooden blocks
Smash 5000 stone blocks
Smash 5000 iced blocks
Pop 1000 pigs
Pop 1000 bubbles
Smash 50 000 blocks
Smash 500 000 blocks
Play Angry Birds Space for 5 hours
Play Angry Birds Space for 15 hours
Play Angry Birds Space for 30 hours
Get 250 stars
Launch 5000 birds
Freeze 500 pigs
Freeze 3 pigs with one ice bird
Make 100 birds exit atmosphere
Make 6 pigs scared with one green bird
Pop pig with another pig
Pop 100 pigs in the main menu