Here is the full list of all 10 Epic World achievements.
You just got your first star.
You got two stars for first time.
You just got three stars for the first time
You just made it through the Frozen land.
You made it through the Lava land.
You made it through the Ghost land.
You made it through the Sky land.
You made it through the Dry land.
You made it through the Dark Jungle.
You made it through the Dungeon.