Here is the full list of all 14 Rock of Ages II: Bigger and Boulder achievements worth 1,000 gamerscore.
Win an online match of War.
Win the match against God without letting him score any goals.
Defeat the Sphynx without losing any boulders.
Destroy the enemy boulder using the thundercloud.
Defeat the Dragon without losing any boulders.
Defeat The Thinker without losing any boulders.
Get a bronze medal in all time trial levels.
Get a silver medal in all time trial levels.
Get a gold medal in all time trial levels.
Win a match of War without letting the enemy touch your door.
Win an online match of Obstacle Race.
Win a match of War using only animals to defend.
Cross the Dragon's sea once without falling into the water.
Destroy the castle doors using the Block of Ages.