Here is the full list of all 26 Thea 2: The Shattering achievements.
Reach lvl 20 on a character.
Destroy 5 settlements.
Craft 50 equipment items.
Play for 500 turns.
Have Goblin Wine as food during one night (9 consecutive night turns).
Visit another biome.
Win a difficulty 5+ challenge without sustaining any damage.
Recruit Captain Bear.
Complete all Theopedia terrain entries.
Complete Resources research tree.
Complete Items research tree.
Unlock all gods.
Finish the main quest playing on hard difficulty.
Start with two human children only and survive 100 turns.
Retreat from a difficulty 1 challenge.
Craft The Other Ring using only Tier 5 materials.
Finish the main quest and become allied with the Light.
Have a character die in a group without food.
Finish the Divine Path quest with a chosen who started as a rat.
Win without founding a village.
Do not let your people consume meat or meat-containing meals for 50 turns.
Have 20 different food types in a group's inventory.
Travel 1000 tiles on sea.
Eliminate all opponents before the Fight Phase begins.
Win a challenge that autoresolve deemed to be unbeatable.
Trade for 3000 worth of items using only food.