Here is the full list of all 17 Him & Her Collection achievements.
Complete half of the levels of Him & Her on easy mode
Restart the level
Start a level on Him & Her
Start a level on Him & Her 2 - Her Challenges
Start a level on Him & Her 3
Complete half of the levels of Him & Her 2 - Her Challenges on easy mode
Complete half of the levels of Him & Her 3 on easy mode
Complete half of the levels of Him & Her on hard mode
Complete half of the levels of Him & Her 2 - Her Challenges on hard mode
Complete half of the levels of Him & Her 3 on hard mode
Beat Him & Her on easy mode
Beat Him & Her 2 - Her Challenges on easy mode
Beat Him & Her 3 on easy mode
Beat Him & Her on hard mode
Beat Him & Her 2 - Her Challenges on hard mode
Beat Him & Her 3 on hard mode
Unlock all Achievements