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