Here is the full list of all 185 IIN achievements.
The base game contains 25 achievements, and there is 1 DLC pack containing 160 achievements.
Beat the extra group
Unlock the Time Attack
Beat the game on singleplayer
Complete the eigth group
Push buttons using boxes 100 times
Hit another soul 9 times
Start a multiplayer game
Complete the seventh group
Complete the sixth group
Die 77 times
Beat any level without touching the barrier
Complete the fifth group
Complete the forth group
Beat Level 34 without enter on circle's box
Complete the third group
Complete the second group
Discover the Circle box's special move
Complete the first group
Discover the Triangle box's special move
Beat the game on multiplayer
Beat the game on Time Attack in under 80 minutes
Beat the game on Time Attack in under 60 minutes
Beat the game on Time Attack in under 40 minutes
Life's Worth
Complete all achievements
Level 6 Completed