Complete the following achievements to unlock Xbox Live Gamerscore points.
| Achievement | How to unlock | 
|---|
| A Cunning Plan! ( 10 points )
 | Collapse the battlefield by destroying the support pillars.
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| A Pyrrhic Victory ( 35 points )
 | Escape Cair Paravel with Queen Susan's Horn.
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| Approach To The How ( 10 points )
 | Complete the Approach to Aslan's How area.
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| Aslan's Gift ( 70 points )
 | Rid Narnia of the Telmarines.
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| Bell Tower Rescue ( 10 points )
 | Rescue Edmund and Trumpkin from the bell tower.
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| Cair Paravel Custodian ( 10 points )
 | Rescue Queen Susan's Horn from the throne room.
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| Caspian's Retribution ( 20 points )
 | Seek vengeance from 200 Telmarine soldiers.
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| Cave Dweller ( 10 points )
 | Work through the cavern to find a grapple.
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| Centaur Charge ( 15 points )
 | Charge around as the centaur and take out 40 Telmarines.
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| Coastal Guardian ( 10 points )
 | Fend off the Telmarine ships.
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| Conqueror Of Lord Glozelle ( 10 points )
 | Defeat Lord Glozelle in the Cistern.
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| Conqueror Of Lord Gregoire ( 10 points )
 | Defeat Lord Gregoire in battle.
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| Courtyard Pugilist ( 10 points )
 | Battle through the courtyard to get to Peter.
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| Defense Of The How ( 35 points )
 | Successfully complete all areas in and around Aslan's How.
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| Equestrian Antics ( 10 points )
 | Defeat 20 enemies while on horseback.
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| Father Christmas' Gifts ( 10 points )
 | Explore the treasure rooms and find the Pevensie's clothes and gifts.
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| Feral Forest ( 10 points )
 | Find a safe route through the woods.
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| Find A Friend ( 15 points )
 | Play 5 missions in co-op play.
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| Fun With Friends ( 40 points )
 | Play 15 missions in co-op play.
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| Gigantic Allies ( 10 points )
 | Defeat the archers that are threatening Cair Paravel.
 | 
|  | Defeat 75 Telmarines as Susan.
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| Gryphon Flight ( 10 points )
 | Use gryphons to take out the turret sentries.
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| Into The Cistern ( 10 points )
 | Find a way into the secret cistern in Aslan's How.
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| Junior Treasure Hunter ( 10 points )
 | Open 10 bonus chests in single or co-op play.
 | 
|  | Rescue Cornelius from the dungeons of Miraz's Castle.
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| Lucy's Escape ( 10 points )
 | Help Lucy escape on horseback from the How.
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| Miraz Vanquished ( 10 points )
 | Defeat King Miraz in the combat ring.
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| My Body Is A Temple ( 40 points )
 | Upgrade your health fully in the game.
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| Nature's Vengeance ( 10 points )
 | Take control of the trees and destroy the Telmarine army.
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| Portcullis Peril ( 10 points )
 | Open the portcullis and let the Narnian army in.
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| Remarkable Rodent ( 15 points )
 | Defeat 25 enemies as Reepicheep.
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| Reply To All ( 15 points )
 | Issue a reply to 100 Telmarine enemies in the battle.
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| River Retrieval ( 10 points )
 | Rescue Trumpkin from the water.
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| Ruins Revealed ( 35 points )
 | Complete the entire Cair Paravel Ruins area.
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| Salubrious Slumber ( 10 points )
 | Send 10 guards to sleep with Cornelius' sleep potions.
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| Senior Treasure Hunter ( 50 points )
 | Open 50 bonus chests in single or co-op play.
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| Siege Weapon Destruction ( 10 points )
 | Use the giants to destroy the catapults in Cair Paravel.
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| Silent Sentries ( 10 points )
 | Defeat the sentries along the castle walls.
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| Small Is Big ( 10 points )
 | Reach the control room to let the Narnian army in.
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| Smash The Pane ( 10 points )
 |  | 
| Stable Rescue ( 10 points )
 | Rescue Cornelius from the stables in Miraz's Castle.
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| Stemming The Telmarine Tide ( 10 points )
 | Seal the doors and escape Cair Paravel.
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| Surprise Attack ( 10 points )
 | Rescue Prince Caspian on the battlefield of Beruna.
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| Surreptitious Arrival ( 35 points )
 | Complete all of the areas within Miraz's Castle Infiltration.
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| Treasure Hunter ( 25 points )
 | Open 25 bonus chests in single or co-op play.
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| Treasure Hunter Extraordinaire ( 75 points )
 | Open 75 bonus chests in single or co-op play.
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| Treasure Meister ( 100 points )
 | Open ALL bonus chests in single or co-op play.
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| Trumpkin's Delight ( 15 points )
 | Defeat 50 Telmarines as Trumpkin.
 | 
| Tyrus The Brave ( 10 points )
 | Reach King Miraz by scaling the castle terraces.
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| Valiant Escape ( 35 points )
 | Complete all of the areas in Miraz Castle Assault.
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When you see treasure keys on the ground, pick them up. They can be used to open treasure chests with a snowman floating above it.