Here is the full list of all 100 Hentai: The Shell Game achievements. It takes around 0-1 hour to unlock all of the achievements.
Complete Extra Level
Open 2 Part of Extra Picture
Open 3 Part of Extra Picture
Open 4 Part of Extra Picture
Open All Parts of Extra Level
11
Become 11 Star Master
Open 1 Part of Extra Picture
Complete Level 10
Open 2 Part of Picture 10
Open 3 Part of Picture 10
Open 4 Part of Picture 10
Open 5 Part of Picture 10
Open 6 Part of Picture 10
Open 7 Part of Picture 10
Open 8 Part of Picture 10
Open 9 Part of Picture 10
Open 10 Part of Picture 10
Open All Parts of 10 Level
10
Become 10 Star Master
Open 1 Part of Picture 10
Complete Level 9
Open 2 Part of Picture 9
Open 3 Part of Picture 9
Open 4 Part of Picture 9
Open 5 Part of Picture 9
Open 6 Part of Picture 9
Open 7 Part of Picture 9
Open 8 Part of Picture 9
Open 9 Part of Picture 9
Open All Parts of 9 Level
9
Become 9 Star Master
Open 1 Part of Picture 9
Complete Level 8
Open 2 Part of Picture 8
Open 3 Part of Picture 8
Open 4 Part of Picture 8
Open 5 Part of Picture 8
Open 6 Part of Picture 8
Open 7 Part of Picture 8
Open 8 Part of Picture 8
Open All Parts of 8 Level
8
Become 8 Star Master
Open 1 Part of Picture 8
Complete Level 6
Complete Level 7
Open 1 Part of Picture 7
Open 2 Part of Picture 7
Open 3 Part of Picture 7
Open 4 Part of Picture 7
Open 5 Part of Picture 7
Open 6 Part of Picture 7
Open 7 Part of Picture 7
Open All Parts of 6 Level
Open All Parts of 7 Level
6
7
Become 6 Star Master
Become 7 Star Master
Open 6 Part of Picture 6
Open 5 Part of Picture 6
Open 4 Part of Picture 6
Open 3 Part of Picture 6
Open 2 Part of Picture 6
Open 1 Part of Picture 6
Complete Level 5
Open 5 Part of Picture 5
Open All Parts of 5 Level
5
Become 5 Star Master
Open 4 Part of Picture 5
Open 3 Part of Picture 5
Open 2 Part of Picture 5
Open 1 Part of Picture 5
Complete Level 4
Open 4 Part of Picture 4
Open All Parts of 4 Level
4
Open 3 Part of Picture 4
Open 2 Part of Picture 4
Open 1 Part of Picture 4
Complete Level 3
Open All Parts of 3 Level
3
Open 3 Part of Picture 3
Open 2 Part of Picture 3
Open 1 Part of Picture 3
Complete Level 2
Open All Parts of 2 Level
2
Open 2 Part of Picture 2
Open 1 Part of Picture 2
Complete Level 1
Open 2 Part of Picture 1
Open All Parts of 1 Level
1
Open 1 Part of Picture 1