Pebble Pickoff
Complete wave 1 on Intermediate difficulty or harder.
Rock Wrangling
Complete wave 3 on Intermediate difficulty or harder.
Meteor Master
Complete wave 5 on Intermediate difficulty or harder.
Asteroid Ace
Complete wave 10 on Intermediate difficulty or harder.
Space Junkie
Score 10,000 points on Expert difficulty.
Debris Dustoff
Score 20,000 points on Expert difficulty.
Clean Sweep
Score 30,000 points on Expert difficulty.
Aim Small Miss Small
Destroy a small saucer on Expert difficulty.
Mow and Flow
Destroy five large saucers without dying on Expert difficulty.
Interdimensional Sniper
Destroy a saucer within two seconds of returning from hyperspace.
Battle in the Belt
Complete the first three waves without dying on Expert difficulty.
Stand Your Ground
Clear a wave without moving on Expert difficulty.