Here is the full list of all 21 PARTICLE MACE achievements.
Score 3000 on Hard
You'll need to unlock all of the ships
Score 3000 on Easy
Complete the credits without crashing
Get killed by the snitch foe
5000 player ships have exploded.
Kill 10000 foes
Score 400 on Asteroid
Score 3001 on Easy with the Show-off Ship
Score 3001 on Hard with the Show-off Ship
Score 401 on Asteroid with the Show-off Ship
Score 4000 on Easy in co-op
Score 4000 on Hard in co-op
Score 500 on Asteroid in co-op
Have 1000 deaths in Deathmatch
Revive a teammate 15 times in one co-op game
Go 60 seconds without killing or crashing in co-op Hard
Crack open some XML
You earn this achievement by earning it.
Beat the entire game. Everything must be complete. There can be nothing left to do, no score to beat, no foe to smash.
Last long enough for the music to loop in single player Hard mode.