Here is the full list of all 33 Ilamentia achievements.
completion all stages within islands of #1
completion all stages within islands of #2
completion all stages within islands of #3
completion all stages within islands of #4
completion all stages within islands of #5
completion all stages within islands of #6
completion all stages within islands of #7
completion all stages within islands of #8
...
reveal island stages of #1
reveal island stages of #2
reveal island stages of #3
reveal island stages of #4
reveal island stages of #5
reveal island stages of #6
reveal island stages of #7
reveal island stages of #8
Tread worn paths of #1
Tread worn paths of #2
Tread worn paths of #3
Tread worn paths of #4
Tread worn paths of #5
Tread worn paths of #6
Tread worn paths of #7
Tread worn paths of #8
See fresh sights of #1
See fresh sights of #2
See fresh sights of #3
See fresh sights of #4
See fresh sights of #5
See fresh sights of #6
See fresh sights of #7
See fresh sights of #8