Here is the full list of all 25 3D Hentai Checkers achievements.
Sophia Stage 5
Sophia Stage 4
Sophia Stage 3
Sophia Stage 2
Sophia Stage 1
Lily Stage 5
Lily Stage 4
Lily Stage 3
Lily Stage 2
Lily Stage 1
Ava Stage 5
Ava Stage 4
Ava Stage 3
Ava Stage 2
Ava Stage 1
Emma Stage 5
Emma Stage 4
Emma Stage 3
Emma Stage 2
Emma Stage 1
Amber Stage 5
Amber Stage 4
Amber Stage 3
Amber Stage 2
Amber Stage 1