Complete these acheivements ingame.

Apocalypse
Stay alive long enough for the screen to accumulate 20 baddies - then zap 'em

Crystal Master
Score 1,000,000 or more points in one game

Crystal Ninja
Score 10,000,000 points or more in one game at standard difficulty level or lower

Crystal Rookie
Score 10,000 points or more in one game at standard difficulty level or lower

Immortal
Reach 1,000,000 points without losing a life at standard difficulty level or higher

Life-saver
Have 30 lives in hand at standard difficulty level or higher

Marathon Man
Complete the first 60 waves in a single game

Navigator
Finish wave 20 without touching a mine or other obstacle at standard difficulty level or higher

Nerves Of Steel
Reach 1,000,000 without using a single smart bomb

Smart-ass
Have 30 smarts in hand at standard difficulty level or higher

Speek Freak
Complete the first wave in 5 seconds

Treasure Hunt
Collect 30 or more bonus crystals in a single game