Here is the full list of all 28 PIXELMAN achievements.
Complete Arcade Mode on Easy Difficulty
Eat 200 fried chickens in total
Go between 200 rockets
Hit by lasers for more than 20 seconds in total
You've destroyed 3 buildings in a row!
Survive a fly through the asteroid field without taking any damage
You've destroyed a building!
Cross 10 entire tunnels in the dark in total
Go between 50 rockets
Pass through 100 trees
You've rescued 40 citizens in a row in one gameplay
Rescue 100 girls in total using Pixelgirl
You've reached 2000 points without being hit by anything in one gameplay
You've heard the PIXELMAN theme 4 times in one gameplay
Take down 10 enemy planes using Powerups
Cross an entire tunnel in the dark
Unlock Endless Spacestation Mode
Hit by two bombs from the same plane... and survive!
Survive for 5 minutes in one gameplay
You've made more than 9000 points in one game
Hit by rockets 10 times in one gameplay
I'm starting to think you're doing this on purpose
Unlock Endless City Mode
Unlock your first podium
Rescue 2000 Citizens
Unlock all podiums
Complete Arcade Mode on Medium Difficulty
Complete Arcade Mode on Hard Difficulty