Here is the full list of all 21 Randoville achievements.
Get your first 20
Regress for the first time
Get 100 stone from clicking rocks
Have 10 or more peasants
Grab 100 lootables
Build 10 Fields
Build 5 Zones
Build 50 meters of fence
Delete 100 trees
Spend an in-game week
Spend an in-game month
Throw the Dice 10 times
Throw the Dice 50 times
Throw the Dice 100 times
Throw the Dice 250 times, wow
Nice progress, but it's not the end
You did it, Legend
Roll two 20s in a row
Plant 100 trees
Start fishing
Catch 25 fishes