Here is the full list of all 19 Rock of Ages achievements.
Win 10 online War games.
Win an online War game
Win a War game using the Cube.
Get a gold medal on all maps in Time Trial mode.
Beat the game in Story mode.
Find all the keys scattered throughout the levels.
Destroy a flying ship.
Win a match with your gate unscathed.
Land a projectile on some TNT to produce a shockwave combo that hits your enemy.
Destroy your adversary’s boulder.
Earn more than 7000 gold in one match.
In SkeeBoulder, land your Boulder in the maximum multiplier.
Hit the castle gate with the fireball powerup.
Win a match without destroying any of your adversary's units.
Break off the second layer of your adversary’s boulder.
Break off the first layer of your adversary’s boulder.
Score a direct hit on an enemy boulder with the Castlepult.
Win a match using the Snowball boulder.
Complete the tutorial level and escape from the underworld.