Full list of all 12 Crystal Quest achievements worth 200 gamerscore. It takes around 4-5 hours to unlock all of the achievements on Xbox 360.
Score 250,000,000 or more in one game
Have 30 lives in hand
Destroy 20 nasties with one smart bomb
Avoid mines etc for 20 levels
Finish wave 60
Collect 30 bonus crystals
3,000,000 on first life
Have 30 smarts in hand
5,000,000 points without smarting at standard difficulty level or higher
Score 25,000,000
Collect all the crystals and exit the gateway of wave 1 in 5 seconds or less
Score 250,000 points