Here is the full list of all 25 Dungeons 2 achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Destroyed the Elf Forest with the Demons
You simply fired a furious monster.
You completed the Dungeons 2 campaign!
You collected a total of 25,000 mana.
One of your dungeons reached the highest possible level at one point in time.
You found the Wall of Ice in the Plaguelands.
You owned 200 barrels of beer at one time in the game.
You mined a total of 100,000 gold.
You killed a Unicorn in the campaign.
You collected a total of 2,500 mana.
You defeated Krowtoes, but he narrowly managed to escape.
Took the wrong turn in the Swamp Lands.
You ensured that King Robert met an untimely demise.
A creature steps into the Overworld for the first time in the campaign.
You mined a total of 10,000 gold.
The Prime Evil has died at least once on the first map.
You annihilated all of the Alliance's bases in “Trolls from Hell”.
You managed to hold off all the nobles on the “A blood-red wedding” map. You rascal, you!
You allowed all the nobles to arrive on the “A blood-red wedding” map, and still managed to complete the mission.
You mined a total of 1,000,000 gold.
You collected a total of 250,000 mana.
You won a multiplayer round in “King of the Hill” mode.
You built a “Rolling Stone” trap and it was triggered!
You used the spell “Evil Strikes Back” once.
You have reached a respectable playing time. Glad to hear it! :)