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