Here is the full list of all 24 Sky Tale achievements.
Complete tutorial
Finish your first game
Use spell for first time
Gain 500 points in one match
Gain 25 points in one turn
Place 100 tiles
Place 50 buildings
Play 10 games in Classic mode
Reach Arctic Biome
Gain 10000 points in one match
Gain 50 points in one turn
Place 1000 tiles
Place 500 buildings
Use 100 spells
Reach card unlock 100 times
Earn 50000 points total
Gain 100 points in one turn
Collect 1000 resources
Break 250 resources with buildings
Gain 30 points from Temple placement
Place 4 monuments in one match
Reach card unlock with 0 cards left in the deck
Gain 8 points from Windmill placement 10 times
Reach Arid valley Biome