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.
Beat the game in Story mode.
Win a match using the Snowball boulder.
Win 10 online War games.
Earn more than 7000 gold in one match.
Destroy a flying ship.
Win a match with your gate unscathed.
Land a projectile on some TNT to produce a shockwave combo that hits your enemy.
Win a War game using the Cube.
In SkeeBoulder, land your Boulder in the maximum multiplier.
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.
Win an online War game
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.