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.
Destroy a flying ship.
In SkeeBoulder, land your Boulder in the maximum multiplier.
Win a War game using the Cube.
Earn more than 7000 gold in one match.
Win a match using the Snowball boulder.
Destroy your adversary’s boulder.
Land a projectile on some TNT to produce a shockwave combo that hits your enemy.
Score a direct hit on an enemy boulder with the Castlepult.
Break off the second layer of your adversary’s boulder.
Win 10 online War games.
Break off the first layer of your adversary’s boulder.
Win a match with your gate unscathed.
Win a match without destroying any of your adversary's units.
Win an online War game
Hit the castle gate with the fireball powerup.
Complete the tutorial level and escape from the underworld.