Here is the full list of all 24 Duelists of Eden achievements.
Reach level 10 on Saffron
Complete 100 matches
Play a match in a custom lobby
Create a new deck
Rematch 10 times in a row
Complete 10 matches
Buy something in the shop
Win an online match
Complete the tutorial
Beat Gauntlet mode
Reach level 10 on Selicy
Reach level 10 on Terra
Reach level 10 on Reva
Reach level 10 on Gunner
Reach level 10 on Shiso
Reach level 10 on Violette
Reach level 10 on Shopkeeper
Reach level 10 on Chiretta
Reach level 10 on Harissa
Reach level 10 on Dreadwyrm
Reach level 10 on Queen
Reach level 10 on Neera
Reach level 10 on Maypul
Reach level 10 on Hazel