Here is the full list of all 20 Order & Chaos Online (Windows) achievements worth 200 gamerscore.
Finish a Tutorial Mission
Open a Lucky Chest
Assign your talent
Reach level 10
Reach level 15
Reach level 20
Reach level 30
Reach level 40
Reach level 50
Reach level 60
Complete 5 quests
Join a party 5 times
Use the teleport one time
Sell 5 items
Obtain a gold coin
Kill 40 monsters
Loot 20 times
Loot a Good-level Item
Loot a Superior-level Item
Loot an Epic-level Item