Here is the full list of all 16 INDIKA achievements.
Drop the ladder in the tower
Find the icon above the cave
Complete the cave in one prayer
Hit the piano against the walls 5 times
Destroy all the crates at the station
Drown in the pond 10 times
Drown in the river 5 times
Fall off the fish dryer 5 times
Climb the fish dryer without falling
Watch the Drying Scene
Cut off Ilya's hand
Find a pair of bast shoes
Find the kudets
Find an indecent book
Pray for the deceased
Pray while being chased by a dog