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