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