Here is the full list of all 33 Midsummer Night achievements.
Spend two hours in the game
Complete the game
Listen to the story to the end
Discover Dead Forest secret
Climb up the hill
Exit kremlin underground through the Red Chamber
Reveal bear's secret
Help the ghost find his parents
Get to the Flooded island by underway
Get even with the bear
Save the baby from starvation
Help the Apple Tree
Cross the river over the log
Take 9 attempts to pass one of challenges
Spend one hour in the game
Wait out an ancient deity awakening in a hidden place
Cross the swamps
Take 3 attempts to pass one of challenges
Find the trail of the beast
Give strength to the frog
Spend 30 minutes in the game
Punch a one-eyed likho 3 times
Find caves in the forest
Collect antidote
Examine 4 sorts of flowers using Q key
Find the dugout in the forest
Step on a frog 3 times
Exit kremlin underground by the sound of the stream
Get to the Flooded island by water
Use squirrel to get the boat
Reveal Man's name
Pull the merchant out of the swamps
Encourage peasants to change their attitude toward village elders