Here is the full list of all 21 Memories with my Kitten achievements.
Complete all photos
Complete the tenth photo in normal mode
Complete the ninth photo in normal mode
Complete the eighth photo in normal mode
Complete the seventh photo in normal mode
Complete the sixth photo in normal mode
Complete the fifth photo in normal mode
Complete the fourth photo in normal mode
Complete the third photo in normal mode
Complete the second photo in normal mode
Complete the first photo in normal mode
Complete the tenth photo in easy mode
Complete the ninth photo in easy mode
Complete the eighth photo in easy mode
Complete the seventh photo in easy mode
Complete the sixth photo in easy mode
Complete the fifth photo in easy mode
Complete the fourth photo in easy mode
Complete the third photo in easy mode
Complete the second photo in easy mode
Complete the first photo in easy mode