There are 25 achievements worth a total of 1000 points
"Paradise Island" level completed
All Gold Clean-up awards completed
All levels completed without upgrades
Blob and Pinky played a level together
Pinky's Guide to Inkies completed
All story levels completed in normal mode
All story levels completed to "S" class
All Gold Environment awards completed
All Gold Liberation awards completed
Every Inspiration pickup collected or earned
Every Gallery pickup collected
Blob and Pinky completely upgraded
"Prison Zoo" level completed
"Blanc TV Factory" level completed
"Inktron Collider" level completed
"Hypno Ray" level completed
"Rocket Range" level completed
"Inky Fabricator" level completed
"Blanctown" level completed
"Downtown" level completed
"Blanc Cola Cannery" level completed
"Comrade Black U." level completed
"The Senate" level completed
Completed a level in a single playthrough without dying
Completed 10 continuous piston jumps