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