Here is the full list of all 55 Cupid Nonogram achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Completed Stage 50
Completed Stage 48
Completed Stage 51
Completed Stage 54
Completed Stage 53
Completed Stage 52
Completed Stage 49
Completed Stage 55
Completed Stage 47
Completed Stage 46
Completed Stage 45
Completed Stage 42
Completed Stage 41
Completed Stage 37
Completed Stage 36
Completed Stage 35
Completed Stage 34
Completed Stage 40
Completed Stage 39
Completed Stage 38
Completed Stage 33
Completed Stage 44
Completed Stage 43
Completed Stage 32
Completed Stage 31
Completed Stage 30
Completed Stage 29
Completed Stage 28
Completed Stage 27
Completed Stage 26
Completed Stage 25
Completed Stage 24
Completed Stage 23
Completed Stage 22
Completed Stage 21
Completed Stage 20
Completed Stage 19
Completed Stage 18
Completed Stage 17
Completed Stage 16
Completed Stage 15
Completed Stage 14
Completed Stage 13
Completed Stage 12
Completed Stage 11
Completed Stage 10
Completed Stage 9
Completed Stage 8
Completed Stage 7
Completed Stage 6
Completed Stage 5
Completed Stage 4
Completed Stage 3
Completed Stage 2
Completed Stage 1