Here is the full list of all 27 Sky Clash: Lords of Clans 3D achievements.
Upgrade the Town Hall to level 8
Unlock a Destroyer at the Munition Factory
Upgrade the Gold Storage to level 10
Join Magnetic League
Join Azure League
Upgrade the Town Hall to level 5
Win 1,250 trophies
Upgrade the Clan Hangar to level 2
Upgrade the Clan Hangar to level 1
Upgrade the Town Hall to level 3
Remove 1,500 islands, merchants or wanderers
Steal 100,000,000 gold in Multiplayer battles
Steal 100,000,000 steam in Multiplayer battles
Destroy 2,000 Walls in Multiplayer battles
Destroy 2,000 Town Halls in Multiplayer battles
Destroy 2,500 Builder's Docks in Multiplayer battles
Carry out 5,000 successful attacks on other players
Repel 5,000 attacks of other players
Destroy 5,000 Mortars in Multiplayer battles
Donate 25,000 Hangar capacity worth of reinforcements
Destroy 2,500 Storm Cannons in Multiplayer battles
Destroy 5,000 Atomizer Towers in Multiplayer battles
Upgrade the Clan Hangar to level 4
Steal 20,000 energy in Multiplayer battles
Steal 250,000 energy in Multiplayer battles
Steal 1,000,000 energy in Multiplayer battles
Join Assault League