Successfully complete the indicated task to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", "My profile", "View all my games", then the game and view stats.

Achievement	How to unlock
A war to win Lyanna back	Complete 'The War of the Usurper' campaign.
Aegon Targaryen	Win 100 multiplayer games.
All-round experience	Play as each of the eight Houses in a multiplayer game or vs AI.
Believer	Take control of a sept less than 1 minute after the start of the game and never lose it during a multiplayer game or vs AI.
Beric Dondarrion	Win 10 multiplayer games.
Bloodied	Defeat an opponent, leaving him with only 15 Prestige Points.
Bruised	Defeat an opponent, leaving him with only 30 Prestige Points.
Captain	Win on all maps in multiplayer mode with 2 players.
Captivated	Play for a total of 20 hours.
City Watch	Make at least 5 arrests during a multiplayer game or vs AI.
Commander of the vanguard	Beat all AI levels.
Conqueror	Complete 'The War of Conquest' campaign.
Conqueror	Achieve victory with each of the eight Houses in a multiplayer game or vs AI.
Don't Upset Me	Complete all challenges during multiplayer games or vs AI.
Dragonlord	Complete 'The Dance of the Dragons' campaign.
Eight Reasons to Smile	Win 3 multiplayer games playing with the 8 Houses.
Envoy	Have a level 3 envoy during a multiplayer game or vs AI.
Erase Replay	Be defeated by an AI opponent before the outbreak of war.
Faceless Man	Have a level 3 assassin during a multiplayer game or vs AI.
Field commander	Win on on all maps in multiplayer mode with 6 players.
First Blood	First blood in a game with 4, 6 or 8 players.
Flush of shame	Be defeated by the weakest AI level.
For the King!	Complete 'The Conquest of Dorne' chapter in less than 10 minutes.
Friendless	Be defeated by an AI opponent without having a single ally.
Friends in abundance	Realise 80% of all possible alliances during a multiplayer game or vs AI.
Gamer	Complete all game achievements in single player mode.
Good Start	First victory vs AI.
Hand of the King	Win on on all maps in multiplayer mode with 8 players.
Heartsbane	Win a 6-player game.
Ice	Win an 8-player game.
Khal Drogo	Win 25 multiplayer games.
King Tommen	First victory in multiplayer mode.
Knight	Win on on all maps in multiplayer mode with 4 players.
Know your enemy	Play and win on all maps in multiplayer mode.
Knowledge of the realm	Play and win on all maps vs AI.
Longclaw	Win a 2-player game.
Lord Commander	Do not lose a single army during 'The Wall' chapter.
Lukewarm	Play for a total of 5 hours.
Mad About the Game	Play for a total of 50 hours.
Maester of the Citadel	Have viewed 30 explanations in the encyclopaedia.
Master of whisperers	Obtain 4 secret agreements simultaneously during a multiplayer game or vs AI.
Melee	Win a 'free for all' game against at least 3 AI players.
Mine by Rights!	Take control of a gold mine and never lose it during a multiplayer game or vs AI.
Night's Watch	Complete 'the wall' campaign.
Nightfall	Win a 4-player game.
Not quite so unique!	Killed or imprison, at least once, the unique unit of each House.
Novice of the Citadel	Have viewed 10 explanations in the encyclopaedia.
One of a kind!	Hire the unique unit of each House.
One! Two! Three!	Complete 3 challenges during a multiplayer game or vs AI.
Pass out of training	Play for a total of 10 hours in multiplayer mode.
Possessive	Gain a title and never lose it during a multiplayer game or vs AI.
Protector of the Realm	Complet all multiplayer achievements.
Put to rout	Defeat an opponent, leaving him with no Prestige Point.
Rebel at Heart	Complete 'The Conquest of Dorne' campaign.
Seneschal of the Citadel	Have viewed all explanations in the encyclopaedia.
Sibling rivalry	Play both brother and sister in the 'Dance of the Dragons' campaign.
Smell of Summer	Play for a total of 2 hours in multiplayer mode.
Spectator	Watch a replay.
Stannis Baratheon	Complete 40 achievements.
Ten thousand ships	Complete 'The Rhoynar land in Dorne' campaign.
The more the merrier	Play for a total of 30 hours in multiplayer mode.
The Mountain That Rides	Eliminate 100 units during multiplayer games or vs AI.
The power of dragons	Complete 'the stormlands' chapter in less than 10 minutes.
The victor writes the book of history	Complete all the campaign achievements.
The Young Dragon	Complete all achievements.
Thoros de Myr	Complete 20 achievements.
Tywin Lannister	Win 50 multiplayer games.
Unassailable	Hire your unique unit less than 3 minutes after the start of the game and never lose it during a multiplayer game or vs AI
Unbowed, Unbent, Unbroken	Do not lose an army during 'The Rhoynar land in Dorne' campaign.
Valar morghulis	Commit 3 assassinations in less than 60 seconds.
Varys	Have 3 turncoats in the enemy camp, at the same time, during a multiplayer game or vs AI.
Very... Interesting!	View the game credits right to the end.
Why wait for war ?	Defeat an AI player in Hard or Expert modes before the outbreak of war.
Wrath and wile	Complete the 'Battle of Summerhall' chapter while retaining, at least, 50% of your starting army.