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