Here is the full list of all 32 Magic of Autumn achievements.
Complete the tutorial.
Conjure 10 cards.
Win a fight with a deck that has less than 3 cards.
Win a fight with a deck that has 20 cards.
Break 25 runes.
Conjure all cards.
Step into a pentagram.
Have an idol with 10 or more attack.
Increase your avatar's health to 30.
Break twenty idols rune.
Use Altar of the Eternal Fire.
Conjure all tree cards.
Conjure all fire cards.
Conjure all spirit cards.
Break four charged runes.
Win a fight by using poison to deal the final damage to a rune.
Win a fight with 1 health remaining.
Play a card that costs more than 9 warmth.
Find and break an overgrown rune.
Win the game.
Break a challenge rune.