Here is the full list of all 17 Cross Set achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Complete Level 8.
Clear every level.
Complete Level 7.
Reveal Level 8.
Complete Level 6.
Reveal Level 7.
Complete Level 5.
Reveal Level 6.
Complete Level 4.
Reveal Level 5.
Complete Level 3.
Reveal Level 4.
Complete Level 2.
Reveal Level 3.
Complete Level 1.
Reveal Level 2.
Solve one level.