Here is the full list of all 30 Bramble: The Mountain King achievements.
Complete the game
Dethrone the Mountain King
Find the King Nils wooden figurine
Find all story books
Free yourself from Bramble
Escape Pesta
Find the Pesta wooden figurine
Find the Skogsrå wooden figurine
Make it through Skogsrå's grove
Stab Skogsrå 100 times
Defeat the swamp midwife
Brew a potion. Bring out the scales!
Find the Kärrhäxan wooden figurine
Survive against Näcken
Find the Lemus wooden figurine
Find the troll wooden figurine
Sacrifice the gnome
Defeat the butcher
Jump on the mushrooms 5 times
Find all wooden figurines
Kick an apple into the goal
Complete the path of traps without any gnome casualties
Kick the pinecone folk out of the cave
Find the Lillemor wooden figurine
Find the gnome wooden figurine
Find the Näcken wooden figurine
Find the Tuva wooden figurine
Find the Lyktgubben wooden figurine
Complete a playthrough without dying or restarting levels
Find the toy duck and place it on the grave