Here is the full list of all 8 Mahjong Strip Solitaire: Harem Guild achievements. It takes around 3-4 hours to unlock all of the achievements.
Clear all of Sonia's stages.
Clear all the stages.
Clear all of Alicia's stages.
Clear all of Nell's stages.
Clear all of Sara's stages.
Clear all of Tina's stages.
Match all the tiles and clear a stage.
Play the game.