Here is the full list of all 69 Hyper-Casual Hentai achievements.
Solved all puzzles for image F
Completed 65 puzzles
Completed 60 puzzles
Found Hidden Sloth #8
Solved all puzzles for image E
Completed 55 puzzles
Completed 50 puzzles
Found Hidden Sloth #4
Completed 45 puzzles
Solved all puzzles for image D
Found Hidden Sloth #14
Completed 40 puzzles
Completed 35 puzzles
Solved all puzzles for image C
Completed 30 puzzles
Completed 25 puzzles
Found Hidden Sloth #3
Solved all puzzles for image B
Found Hidden Sloth #6
Completed 20 puzzles
Completed 15 puzzles
Found Hidden Sloth #1
Solved all puzzles for image A
Completed 10 puzzles
Completed 5 puzzles
Found Hidden Sloth #2
Found Hidden Sloth #5
Found Hidden Sloth #7
Found Hidden Sloth #9
Found Hidden Sloth #10
Found Hidden Sloth #11
Found Hidden Sloth #12
Found Hidden Sloth #13
Found Hidden Sloth #15
Found Hidden Sloth #16
Found Hidden Sloth #17
Found Hidden Sloth #18
Found Hidden Sloth #19
Found Hidden Sloth #20
Solved all puzzles for image G
Solved all puzzles for image H
Solved all puzzles for image I
Solved all puzzles for image J
Solved all puzzles for image K
Solved all puzzles for image L
Solved all puzzles for image M
Solved all puzzles for image N
Solved all puzzles for image O
Completed 70 puzzles
Completed 75 puzzles
Completed 80 puzzles
Completed 85 puzzles
Completed 90 puzzles
Completed 95 puzzles
Completed 100 puzzles
Completed 105 puzzles
Completed 110 puzzles
Completed 115 puzzles
Completed 120 puzzles
Completed 125 puzzles
Completed 130 puzzles
Completed 135 puzzles
Completed 140 puzzles
Completed 145 puzzles
Completed 150 puzzles
Completed 155 puzzles
Completed 160 puzzles
Completed 165 puzzles
Complete all puzzles