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