Here is the full list of all 25 de Blob 2 achievements.
Blob and Pinky completely upgraded
All story levels completed to "S" class
"Hypno Ray" level completed
All Gold Clean-up awards completed
All Gold Liberation awards completed
All Gold Environment awards completed
Every Gallery pickup collected
Every Inspiration pickup collected or earned
Pinky's Guide to Inkies completed
All story levels completed in normal mode
Blob and Pinky played a level together
All levels completed without upgrades
Completed 10 continuous piston jumps
"Rocket Range" level completed
"Inky Fabricator" level completed
"Prison Zoo" level completed
"Blanc TV Factory" level completed
"Inktron Collider" level completed
"Blanc Cola Cannery" level completed
"Comrade Black U." level completed
"The Senate" level completed
"Blanctown" level completed
"Downtown" level completed
"Paradise Island" level completed
Completed a level in a single playthrough without dying