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