Here is the full list of all 42 Bullshot achievements.
Watch the credits.
Break the car in the bonus stage
Escape from the prison
Kill 1000 cardesians
Charge 100 enemies in one game.
Kill 100 cardesians
Change the settings of the TV filter.
Kill 10 cardesians
Find the collectables in the prison
Free all B.O.A. in the prison
Finish the sewers stage
Find the collectables in the sewers
Finish the desert stage
Find the collectables in the desert
Finish a stage with full health
Finish a non-bonus stage without jumping
Destroy the van from above
Finish the biker stage
Find the reader in the prison
Find the reader in the sewers
All that glitters...
Destroy the heart of the giant worm
Find the reader in the desert
Finish the heart in the bloodiest way
Finish the bio technology lab stage.
Find the collectables in the bio technology lab.
Finish the Oil Fields stage.
Find the collectables in the oil fields.