Full list of all 26 Oh My Girl achievements.
The base game contains 19 achievements, and there is 1 DLC pack containing 7 achievements.
Complete Spring's OL Challenge
Complete Spring's Leather Challenge
Complete Summer's X'mas Challenge
Complete Autumn's Nurse Challenge
Complete Autumn's Swimming Challenge
Complete Your First Image
Complete A Picture in 2 mins
Complete All Spring's Images
Complete All Summer's Images
Complete All Autumn's Images
Failed one time
Complete 2 Tiles In a Row
Complete 3 Tiles In a Row
Complete 4 Tiles In a Row
Complete 5 Tiles In a Row
Complete 6 Tiles In a Row
Complete 7 Tiles In a Row
Complete 8 Tiles In a Row
Complete 9 tiles In a Row
Complete Spring's Maid Challenge
Complete Summer's Uniform Challenge
Complete Summer's Bikini Challenge
Complete Autumn's Cosplay Challenge
Complete Winter in the bathroom
Completer Winter in the gym
Completer Winter in pajamas