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