Here is the full list of all 35 Milkcraft achievements.
Defeat the Banshee
Defeat Wraith warlord
Defeat Tane Mahuta
Defeat Sakura
Defeat Frost Witch
Defeat Obsidian Guardian
Defeat Sphinx
Defeat Anubis
Defeat Cleopatra
Defeat Cor Castrum in Realm of Mislay.
Defeat Blaze Lord in Realm of Mislay.
Defeat Night Goddess in Realm of Mislay.
Clear Boundless Realm Crusader
Clear Boundless Realm Temple of War
Clear Boundless Realm Temple of Famine
Clear Boundless Realm Temple of Death
Clear Boundless Realm Dreadlands
Clear Boundless Realm Shadow Chapel
Clear Boundless Realm Twin Goddesses
Clear Boundless Realm Temple of Ashes
Defeat Elite difficulty Sakura
Defeat Elite difficulty Frost Witch
Defeat Elite difficulty Cleopatra
Clear Realm of Mislay Elite Dungeon: Church of Woe
Clear Realm of Mislay Elite Dungeon: Castle Observatory
Unlock your access to all equipment of the Templar Set
Unlock your access to all equipment of the Nightmare Set
Unlock your access to all equipment of the Fallen Angel Set
Unlock your access to all equipment of the Soulmight Set
Unlock your access to all equipment of the Abyss walker Set
Unlock your access to all equipment of the Darkbringer Set
Unlock complete [Fearless] Armor Set
Unlock complete [Falling Star] Armor Set
Unlock complete [Divine Faith] Armor Set
Defeat Midgard Valkyrie.