Here is the full list of all 49 A Druid's Duel achievements.
Finish 5 Online Games.
Earn 20 Trisks in a single Online Game.
Win the Beltaine Season Stone.
Win 3 Online Games.
Take 1st place in an Online Game.
Finish an Online Game.
Take 2nd in an Online Game.
Start a new Online Game.
Win the Deepwinter Season Stone.
Win 1 Map Item.
Win the Wintermourne Season Stone.
Destroyed 3 obstacles in one turn.
Create 3 obstacles in one turn.
Defeat Master Ninonell
Win the Aldenfalle Season Stone.
Destroy a piece of land with an Obstacle on it.
Build 4 Bridges in one turn.
Build 2 Bridges in one turn.
Capture 2 Relics in one turn.
Win the Highsommar Season Stone.
Use 3 wolves in one turn.
Generate 120 Mana in one turn.
Defeat Master Rickett.
Spawn 100 new units.
Change the same Wind Rider into an Eagle twice in one turn.
Attack 3 times in a row with one Bear.
Use 3 Eagles to attack in one turn.
Transform a Snarlclaw into a Bear.
Transform a Waywalker into a Turtle.
Transform a Wind Rider into an Eagle.
Transform a Guardian into a Wolf.
Generate 20,000 lifetime Mana in Campaign and Online play.
Kill a Turtle with a Bear.
Capture 4 Relics in one turn.
Start 5 new Online Games.
Win 10 Online Games.
Win 20 Online Games.
Take 3rd in an Online Game.
Take 4th in an Online Game.
Rise to Wolf Rank in Online play.
Login to Online Play 10 times.
Rise to Eagle Rank in Online play.
Rise to Bear Rank in Online play.
Rise to Turtle Rank in Online play.
Earn 50 Aura in a single Online Game.
Earn 10 Trisks in a single Online Game.
Earn 250 Trisks in Online Play.
Win 4 Map Items.
Win the Midsommar Season Stone (and the game!)