Here is the full list of all 48 Kraken Academy!! achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Complete all side quests.
Save Kraken Academy from doom and destruction.
Free the Drama Club spirit.
Collect all furniture.
Befriend Kostadin.
Collect 75,000 shlotinki.
Befriend the Janitor.
Smash 1000 things.
Go on all the dates.
Witness the end of the world.
Befriend Simona.
Convert 3 bottlemachines to the cause in one time loop.
Befriend the Hobo Guy.
Dig up all piles of dirt in one time loop.
Befriend Patitsa.
Befriend Dimitri.
Travel back to Monday 5 times.
Pull all the levers in the boss's office.
Befriend Jean.
Befriend Pierre.
Collect all club cards.
Free the Sports Club spirit.
Get the drama club uniform.
Put furniture into every slot in your room.
Befriend Vladimir.
Befriend Broccoli Girl.
Befriend Nikolai.
Call your Mom 8 times.
Beat Yuki and Wendy's challenges on hard.
Get a score of 20 or more in Dimitri's challenge.
Score a goal in the gym.
Collect 10,000 shlotinki.
Free the Art Club spirit.
Befriend the Cafeteria Lord.
Summon a poop demon.
Get the cultist robes.
Befriend Ana.
Befriend Ms. Markova.
Smash 250 things.
Collect 175 bottles in one go.
Free the Music Club spirit.
Get the skeleboner costume.
Bounce on a bouncy castle.
Wash your hands in 4 different sinks.
Pet a cat.
Get the penguin costume.
Gain the power to travel back in time.
Collect 75 bottles in one go.