Achievements

Completing Achievements gives you rewards in the form of Experience and Gems. Your Achievements will also appear in the Game Center and on your Profile; each Achievement gives you a set amount of Game Center points.

Since the "Player Profile" update, player's achievements/status (including overachievements) are made public.

There are 66 Achievements currently available:

Bigger Coffers
Upgrade a Gold Storage to level 2: 10 / 2

Upgrade a Gold Storage to level 5: 100 / 5

Upgrade a Gold Storage to level 10: 1,000 / 10

Get those Goblins!
Win 10 stars on the Campaign Map: 10 / 5

Win 50 stars on the Campaign Map: 100 / 10

Win 150 stars on the Campaign Map: 1,000 / 20

Bigger & Better
Upgrade Town Hall to level 3: 10 / 5

Upgrade Town Hall to level 5: 100 / 10

Upgrade Town Hall to level 8: 1,000 / 20

Nice and Tidy
Remove 5 obstacles (trees, rocks, bushes): 10 / 5

Remove 50 obstacles (trees, rocks, bushes): 100 / 10

Remove 500 obstacles (trees, rocks, bushes): 1,000 / 20

Release the Beasts
Unlock Archer in the Barracks: 10 / 5

Unlock Wall Breaker in the Barracks: 100 / 10

Unlock Dragon in the Barracks: 1,000 / 20

Gold Grab
Steal 20,000 Gold: 10 / 5

Steal 1,000,000 Gold: 100 / 10

Steal 100,000,000 Gold: 1,000 / 20

Elixir Escapade
Steal 20,000 Elixir: 10 / 5

Steal 1,000,000 Elixir: 100 / 10

Steal 100,000,000 Elixir: 1,000 / 20

Sweet Victory!
Achieve a total of 75 trophies in Multiplayer battles: 10 / 5

Achieve a total of 750 trophies in Multiplayer battles: 100  / 10

Achieve a total of 1,250 trophies in Multiplayer battles: 1,000 / 450

Empire Builder
Rebuild the Clan Castle: 10 / 5

Upgrade Clan Castle to Level 2: 100 / 10

Upgrade Clan Castle to Level 4: 1,000 / 20

Wall Buster
Destroy 10 Walls in Multiplayer battles: 10 / 5

Destroy 100 Walls in Multiplayer battles: 100 / 10

Destroy 2,000 Walls in Multiplayer battles: 1,000 / 20

Humiliator
Destroy 10 Town Halls in Multiplayer battles: 10 / 5

Destroy 100 Town Halls in Multiplayer battles: 100 / 10

Destroy 2,000 Town Halls in Multiplayer battles: 1,000 / 50

Union Buster
Destroy 25 Builder's Huts in Multiplayer battles: 10 / 5

Destroy 250 Builder's Huts in Multiplayer battles: 100 / 10

Destroy 2,500 Builder's Huts in Multiplayer battles: 1,000 / 30

Conqueror
Win 25 Multiplayer battles: 10 / 5

Win 250 Multiplayer battles: 100 / 10

Win 5,000 Multiplayer battles: 1,000  / 20

Unbreakable
Successfully defend against 10 attacks: 10 / 5

Successfully defend against 250 attacks: 100 / 50

Successfully defend against 5,000 attacks: 1,000 / 100

Friend in Need
Donate 100 Clan Castle capacity worth of reinforcements: 10 / 5

Donate 5,000 Clan Castle capacity worth of reinforcements: 100 / 25

Donate 25,000 Clan Castle capacity worth of reinforcements: 1,000 / 250

Mortar Mauler
Destroy 25 Mortars in Multiplayer battles: 10 / 5

Destroy 500 Mortars in Multiplayer battles: 100 / 10

Destroy 5,000 Mortars in Multiplayer battles: 1,000 / 20

Heroic Heist
Steal 20,000 Dark Elixir: 10 / 5

Steal 250,000 Dark Elixir: 100 / 10

Steal 1,000,000 Dark Elixir: 1,000 / 20

League All-Star
Join the Crystal League: 100 / 250

Reach the Master League: 500  / 1,000

Become a Champion!: 2,000 / 2,000

X-Bow Exterminator
Destroy 1 X-Bow in a Multiplayer battle: 50 / 50

Destroy 250 X-Bows in Multiplayer battles: 100 / 100

Destroy 2,500 X-Bows in Multiplayer battles: 1,000 / 200

Firefighter
Destroy 10 Inferno Towers in Multiplayer battles: 50 / 100

Destroy 250 Inferno Towers in Multiplayer battles: 500  / 200

Destroy 5,000 Inferno Towers in Multiplayer battles: 5,000 / 1,000

War Hero
Score 10 stars for your clan in War Battles: 50 / 50

Score 150 stars for your clan in War Battles: 500 / 200

Score 1,000 stars for your clan in War Battles: 5,000 / 1,000

Spoils of War
Collect 800,000 Gold in Clan War bonuses: 100 / 25

Collect 15,000,000 Gold in Clan War bonuses: 500 / 100

Collect 100,000,000 Gold in Clan War bonuses: 5,000 / 500

Anti-Artillery
Destroy 20 Eagle Artillery in Multiplayer battles: 100 / 150

Destroy 200 Eagle Artillery in Multiplayer battles: 800 / 300

Sharing is Caring
Donate 100 spell storage worth of Spells: 20 / 20

Total
Completing every currently available Achievement gives a total of at least 8,857 Gems and 35,440 Experience, which is enough to buy all five Builder's Huts (with over 5,000 gems left over).

Completing the entire League All-Star achievement totals 3,250 Gems, which is only 250 gems away from the price of the third, fourth, and fifth Builder's Huts.