Here is the full list of all 29 Chip's Challenge 2 achievements.
Completed all the levels between 81 & 100
Completed all the levels between 61 & 80
Completed 20 levels with flags
Completed all the levels between 41 & 60
Completed 20 levels still carrying tools
Completed Lights Out
Completed Monster Race
Completed Trial And Error?
Completed all 7 Lessons
Completed all the levels between 21 & 40
Completed 20 levels on first try
Completed a level with only 0.5s to go
Completed Sapper Do
Completed all the levels between 1 & 20
Completed a level as Melinda
Completed all the levels between 1 & 5
Completed all the levels between 101 & 120
Completed all the levels between 121 & 140
Completed all the levels between 141 & 160
Completed all the levels between 161 & 180
Completed all the levels between 181 & 200
Completed all the levels
Completed 20 levels still carrying keys
Completed Foursome
Completed Rebel
Completed In & Out
Completed Clear Out
Completed Clone
Completed Memories