Here is the full list of all 11 Celebrities Hacked achievements.
Pick up 69 powerups
Expose 90% or more of the level area
Disintegrate 4 OnLine enemies in one level
Gather 18 stars
Respawn 64 times
Hack 6 photos
Finish any level in less than 30 seconds
Gather 9 stars
Hack 3 photos
Gather 3 stars
Hack 1 photo