Here is the full list of all 15 Pandemic Panic! achievements.
Reach 100,000 score
Reach 300,000 score
Reach 600,000 score
Grabbed a pill at 1% health
Shoot the Golden Can
Take out a Buglin mid-air
Improved your top score
Lose a 30x multiplier
Hit a 30x multiplier
Played 200 games
Eliminated 50 Nasties in 'The Grounds' level (one play)
Collected 20 pills in 'The Grounds' level (one play)
Hit a 50x multiplier in 'The Grounds' level
Reach 50,000 score in 'The Grounds' level
Reach 150,000 score in 'The Grounds' level