Here is the full list of all 33 Giraffe and Annika achievements.
Unlocked all achievements
Received a Christmas gift
Cleared every hard rhythm game on S rank
Cleared every rhythm game with no misses
Obtained all bonus drawings from rhythm games
Cleared all rhythm games on all difficulties at A rank or higher
Obtained 3 bonus drawings from rhythm games
Got 'Great Fortune' result on my fortune
Beat the game within 4.5 hours
Delivered something Giraffe forgot
See every conversation with Mrs. Save
Ate 50 foods
Cleared dungeon 5
Cleared every rhythm game at normal or higher
Cleared all rhythm games on hard mode
Collected all meowsterpieces
Hit every drum
Changed into the swimsuit
Stuck your face into every photo stand-in
Cleared dungeon 4
Collected 24 meowsterpieces
Collected every mysterious paper scrap
Collected 18 meowsterpieces
Cleared the Fire Dungeon
Collected 12 meowsterpieces
Took 50 or more photos
Cleared the Ocean Dungeon
Collected 6 meowsterpieces
Saw the special idle animation
Cleared the forest Dungeon
Went into the bathroom 5 times
Obtained the bag
Obtained the key to Lisa's house