Here is the full list of all 20 Total Conquest achievements worth 200 gamerscore.
Reach level 5
Kill 40 enemy units
Win 2 multiplayer battles
Steal 10,000 gold from players
Acquire 3 stars in the campaign
Upgrade the Barracks to Level 5
Use 2 potions
Steal 10,000 food from other players
Destroy 50 enemy towers
Destroy 5 walls or gates
Build 2 Barracks
Collect 400 food
Collect 400 gold
Destroy 20 City Halls
Clear 2 obstacles
Deploy 10 mythological units
Build 2 Villas
Deploy 100 troops in battle
Reach level 30
Reach level 100