Here is the full list of all 31 Elven Legend achievements.
Complete the game
Complete the game for all the stars
Collect 300 food
Collect 700 food
Collect 1500 food
Collect 500 crystals
Collect 1000 crystals
Collect 2000 crystals
Collect 400 water
Collect 800 water
Collect 1800 water
Collect 200 wood
Collect 1000 wood
Collect 2000 wood
Use the bonuses 50 times
Use the bonuses 150 times
Use the bonuses 200 times
Repair 300 buildings
Repair 500 buildings
Repair 750 buildings
Improve 250 buildings
Improve 500 buildings
Improve 700 buildings
Start the game
Go through more than half of the game
Banish 25 monsters
Banish 50 monsters
Banish 75 monsters
Restore 25 roots of vital tree
Restore 50 roots of vital tree
Restore 70 roots of vital tree