Here is the full list of all 58 Malkin achievements.
Create a character
Complete the tutorial
Create an indolent witch who joins the village militia
Win your first battle
Meet the Wolf Kami
Meet the Grapevine Kami
Meet the Stag Kami
Acquire the Sidelong Harp while knowing the spell La Belle Dame Sans Merci
Create a Winter witch who knows the spell Along An Icy Path
Destroy sixteen elf candles
Climb the mountain and get past the switchbacks map
Have all 6 dross gem types in your inventory at once
See dinner ruined
Meet Malkin in your dreams
Refuse to kill Wencel
Kill Wencel
Kill Sudder
Refuse to kill Sudder
Slay all seven ushers in the seaside antechamber
Slay 21 Ushers of the Moth Rod across any number of playthroughs
Slay 66 Ushers of the Moth Rod across any number of playthroughs
Have Heart of the Armanite and Mother Goat's Golden Shears in your inventory
Witness Adji's death in "The Lodestone"
Open six doors with six Keys of Dross in a single playthrough
Open nine doors with nine Keys of Dross in a single playthrough
Hand Astimund's forgeries to the minister
Help Astimund send off his forgeries
Learn how Nnenne died
Summon or subpoena a creature to battle
Summon or subpoena 10 creatures to battle across any number of playthroughs
Summon or subpoena 50 creatures to battle across any number of playthroughs
Summon or subpoena 99 creatures to battle across any number of playthroughs
Enter the Door of Loathing
Enter the Door of Concord
Enter the Door of Sorrow
Open 10 non-unique Appropriations Lockboxes across any number of playthroughs
Open 50 non-unique Appropriations Lockboxes across any number of playthroughs
Open 118 non-unique Appropriations Lockboxes across any number of playthroughs
Destroy Malkin
Get the ending in which Eldest Lady lifts the curse on the woodcutter's son
Become the new dark power of the woods
Get the worst(?) ending
Leave the woods at the end of the game
See the young witch's vision fulfilled in "The Message to Enzibar"
Hear the dragon's tale
Have three encounters with the black deer of the Woods in a single playthrough
Find the Plum Sword
Find the Orchid Sword
Find the Bamboo Sword
Find the Chrysanthemum Sword
Hear Zaurus's Story
Climb Good Ghost Mound after hearing its story
Discover 100% of the map
Help the silver knight and the gold knight find peace (Cairn and Crossroads DLC required)
Defeat ten house dynasts across any number of playthroughs (Cairn and Crossroads DLC required)
Create a young witch with the Hauntings lore who has a background in poetry and pursued a university education (Cairn and Crossroads DLC required)
Summon Wicked Anne (Cairn and Crossroads DLC required)
Get the best good ending or the best evil ending in survival mode