Here is the full list of all 9 Little One - there are A Visual Novel achievements.
Story begins… Accept Andy's request.
Achieve event “A Cat goddess who protects families”.
Achieve event "A living Voodoo Doll".
Trust reaches 100.
Achieve event "A mysterious mask".
Achieve event "I will be with you".
Achieve event "Why don't you trust me".
Achieve event "Let them leave".
Achieve event "Let's go together".